en_tn_condensed/mrk/10/40.md

But who is to sit at my right hand or at my left hand is not mine to give

"But I am not the one who allows people to sit at my right hand or my left hand"

but it is for those for whom it has been prepared

The word "it" refers to the places to his right hand and to his left hand.

it has been prepared

"God has prepared it" or "God has prepared them"