Complex sentence: Initially, CityFlyer continued to operate as a separate unit, but it was eventually absorbed into British Airways'mainline short haul operation at Gatwick in 2001, the result of a change in British Airways' strategy for its Gatwick operation.
Split into simpler sentences: Initially, CityFlyer continued to operate as a separate unit. CityFlyer was eventually absorbed into British Airways'mainline short haul operation at Gatwick in 2001, as a result of a change in British Airways' strategy for its Gatwick operation.