Complex sentence: Aligned with Chach's grandson, Siharas's armies invaded the dead ruler's domains (now administered by Chach's brother Chandar), but their campaign ultimately failed, as Chandar continued to sit on the throne.
Split into simpler sentences: Aligned with Chach's grandson, Siharas's armies invaded the dead ruler's domains, now administered by Chach's brother Chandar. Their campaign ultimately failed, as Chandar continued to sit on the throne.