Complex sentence: Adamson was sacked from "Coronation Street" by producer Bill Podmore in September 1983 for breach of contract when it was discovered Adamson had sold his memoirs "after" the previous warning.
Split into simpler sentences: Adamson was sacked from "Coronation Street" in September 1983 for breach of contract. However, producer Bill Podmore sacked him once it was revealed he had sold his memoirs "after" the previous warning.