Complex sentence: After 1689, the right to select the dey passed to the divan, a council of some sixty notables at first was dominated by the ojaq; but by the 18th century, it had become the dey's instrument.
Split into simpler sentences: After 1689, the right to select the dey passed to the divan, a council of some sixty notables. It was at first dominated by the "ojaq"; but by the 18th century, it had become the dey's instrument.