Complex sentence: When Bauer escapes custody with the aid of Buchanan and Audrey, McGill becomes suspicious that he may have had help from CTU, and Buchanan is detained for insubordination, but was later reinstated when McGill was relieved of duty.
Split into simpler sentences: When Bauer escapes custody, McGill becomes suspicious that he may have had help from CTU. Buchanan decided to help Audrey aid Jack, and as a result he was detained for insubordination, but was later reinstated when McGill was relieved of duty.