Complex sentence: With Alexander established in the south at Ptolemais, Demetrius attempted to persuade the Jews under Jonathan Apphus to serve the Seleucid throne and help defeat him, but Alexander also sent word to Jonathan and promised him more powers and appointed him High Priest of the Jews.
Split into simpler sentences: With Alexander established in the south at Ptolemais, Demetrius attempted to persuade the Jews under Jonathan Apphus to serve the Seleucid throne and help defeat him. But Alexander also sent word to Jonathan, promised him more powers and appointed him High Priest of the Jews.