Complex sentence: Schlichter had three lackluster seasons with Baltimore and Indianapolis; he was suspended during the 1983 season by the NFL, after it became known that he had over $150,000 in outstanding gambling debts.
Split into simpler sentences: Schlichter had three lackluster seasons with Baltimore and Indianapolis. He was suspended during the 1983 season by the NFL, after it became known that he had over $150,000 in outstanding gambling debts.