Complex sentence: Most were withdrawn early and replaced by classes 03 and 04 with the exception of D2554, which was transferred to the Isle of Wight in 1966 to aid the electrification of the Island Line.
Split into simpler sentences: Most were withdrawn early and replaced by classes 03 and 04 but there was one exception. This was D2554 which was transferred to the Isle of Wight in 1966 to aid the electrification of the Island Line.