Complex sentence: Reasonable deductions can be made as to the identity of other figures; the bearded man to David's left is probably Moses, the man in the cap to the right is most likely the "weeping prophet" Jeremiah.
Split into simpler sentences: Reasonable deductions can be made as to the identity of other figures. The bearded figure to David's left is probably Moses, the man in the cap to the right is most likely the "weeping prophet" Jeremiah.