The word reutilizaron is the preterite form of reutilizar in the third person plural.
See the full reutilizar conjugation

reutilizar

Las economías logradas mediante la oficina única en Cabo Verde se reutilizaron para la capacitación del personal de las Naciones Unidas y de los caboverdianos.
The One Office in Cape Verde released resources which were spent on training UN staff and Cape Verdeans.
El proceso de conversión generó 14,1 toneladas de madera sobrante, de las que 4,2 se reutilizaron para fabricar productos para el cuidado de animales y paneles y 9,9 toneladas para la producción de energía.
The conversion process generated 14.1 tonnes of excess wood material, of which 4.2 tonnes were reused for animal care and panel products and 9.9 tonnes was used for energy production.
En la construccion de la catedral reutilizaron diferentes elementos de la mezquita, tales como columnas, el patio de la entrada (patio de los Naranjos) y la Giralda que actualmente ejerce la función de campanario y es el simbolo mas famoso de sevilla.
The builders used some columns and elements from the mosque that were preserved in the cathedral: the Moorish entrance court (Patio de los Naranjos); and the bell tower la Giralda and its the most famous symbol in Seville.
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