Complex sentence: On 21 November 2005, the 900 Motorvator service was replaced by an enhanced Citylink service, with the facility to buy seats through the Megabus website was retained.
Split into simpler sentences: On 21 November 2005, the 900 Motorvator service was replaced by an enhanced Citylink service. However, the facility to buy seats through the Megabus website was retained.