Complex sentence: For a time the AM would run the morning show live from the FM and the rest of the dayparts would run the same playlist but slightly delayed and would run identical IDs, promos, jock announcements customized for the AM.
Split into simpler sentences: For a time the AM station ran the morning show live from the FM. The rest of the dayparts ran the same playlist slightly delayed and ran identical IDs, promos, jock announcements customized for the AM.