The word apartasteis is the preterite form of apartar in the second person plural.
See the full apartar conjugation

apartar

Por eso me apartasteis de Jenny.
That's why you snaked me from Jenny.
Cuando vosotros, la humanidad, os apartasteis de Mí incumpliendo Mis mandamientos y estatutos, se afligió Mi corazón.
When you, mankind, went away from Me by breaking my commandments and statutes, I was grieved in my heart.
Apartasteis a ese niño de su familia.
You took this boy from his family.
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