Complex sentence: In 96 BCE, the Hasmonean king Alexander Jannaeus besieged the city for a year and the inhabitants, who had hoped for help from the Nabatean king Aretas II, were killed and their city destroyed by Jannaeus when did not come to their aid.
Split into simpler sentences: In 96 BCE, the Hasmonean king Alexander Jannaeus besieged the city for a year. The inhabitants, who had hoped for help from the Nabatean king Aretas II, were killed and their city destroyed by Jannaeus when Aretas did not come to their aid.