Complex sentence: During the interregnum in 1733, the Familia supported Stanisław Leszczyński for King, then reconciled with August III (reigned 1733--1763) and became a party of the Royal Court.
Split into simpler sentences: During the interregnum in 1733, the Familia supported Stanisław Leszczyński for King. The Familia decided to reconcile with King Augustus III (reigned 1733--1763), instead, and became a party of the Royal Court.