Could you please correct my translation into English?
Original
El Día de Muertos
En México, desde tiempos prehispánicos se celebra a los difuntos un día al año. En la actualidad, es costumbre que el Día de Muertos, 2 de noviembre, se adornen las tumbas de los seres queridos con flores de cempasúchil y velas que guían a los muertos para encontrar el camino a donde los esperan sus seres queridos. Algunas personas permanecen en vela toda la noche en los panteones, pues se supone que ese día los muertos pueden comunicarse con los vivos. Nuestros muertos llegan a beber, comer, descansar y convivir con sus deudos.
En las casas también se suelen poner altares, llamados ofrendas, con agua, sal, pan, frutas, café, dulces y los alimentos que les gustaban en vida a los difuntos, para recibirlos y ayudarlos a proseguir su viaje al inframundo, o el Mictlan. Las ofrendas también se adornan con flores de cempasúchil, velas, calaveritas de azúcar y fotos de los difuntos, y se prende incienso para ahuyentar a los malos espíritus.

English versión
Day of the Death
In Mexico, since pre-Hispanic times, the dead are celebrated one day a year. Nowadays, during the Day of the Dead, November 2nd, it is customary that the graves of the loved ones are decorated with marigolds and candles. The lights of the candles guide the deceased to find their way to where their loved ones are waiting. Some people stay up all night in the cemeteries, as it is assumed that on that day the deceased can communicate with the living. Our dead come to drink, eat, rest and live with their relatives.

It is also customary to put altars in houses, called offerings, with water, salt, bread, fruits, coffee, candies and foods the deceased liked in life, to receive them and help them continue their journey to the underworld, or the Mictlan. The offerings are also decorated with marigolds, candles, sugar skulls, and photos of the deceased, and incense is lit to ward off evil spirits.
1 Answer
In Mexico, from pre-Hispanic times, the dead are celebrated one day a year. At present, during the Day of the Dead, November 2nd, it is customary that the graves of the loved ones are decorated with marigolds and candles. The light of the candles guides the deceased to find their way to where their loved ones are waiting. Some people stay up all night in the cemeteries, as it is assumed that on that day the deceased can communicate with the living. Our dead come to drink, eat, rest and live with their relatives.
It is also customary to put altars in houses, called offerings, with water, salt, fruits, coffee, sweets and foods the deceased liked in life, to receive them and help them to continue their journey to the underworld, or the Mictlan. The offerings are also decorated with marigolds, sugar skulls, candles and photos of the deceased, and incense is lit to ward off evil spirits.
"From" could be "since" but I'm unsure of your intention here. You could say "dead people" (not dead persons) but "the dead" is more personal. "The lights of the candles guide" is another alternative. Using the "on" just splits up an awkward double "that."