Complex sentence: But by then, XHTZ had already made inroads by luring listeners to their station; from there, XHRM would not recover, and would later suffer a tragic setback when the station owner died in a plane crash that same year.
Split into simpler sentences: But by then, XHTZ had already made inroads by luring listeners to their station. XHRM later suffered a tragic setback when the station owner died in a plane crash that same year.