Complex sentence: Since it is the Passover season which would have been early April, the time for figs had not passed, that is, the figs should still be upon the trees and not yet ripe and therefore not yet gathered.
Split into simpler sentences: Since it is the Passover season which would have been early April, the time for figs had not passed. That is, the figs should still be upon the trees and not yet ripe and therefore not yet gathered.