Complex sentence: Erzhu dominated the imperial court thereafter, the emperor held power in name only and most decisions actually went through the Erzhu, although he did put out most of the rebellions, largely reunifying the Northern Wei state.
Split into simpler sentences: Erzhu dominated the imperial court thereafter, the emperor held power in name only and most decisions actually went through the Erzhu. The emperor did stop most of the rebellions, largely reunifying the Northern Wei state.