Complex sentence: Because of this conflict between Mariamne and Salome, when Herod visited Augustus in Rhodes, he separated the women--he left his sister and his sons in Masada while he moved his wife and mother-in-law, Alexandra, to Alexandrium.
Split into simpler sentences: Because of this conflict between Mariamne and Salome, when Herod visited Augustus in Rhodes, he separated the women. He left his sister and his sons in Masada while he moved his wife and mother-in-law to Alexandrium.