Complex sentence: In addition to Sikorsky, General Dynamics Canada and L-3 MAS, Sikorsky's subcontractors, are responsible for in-service maintenance and the Maritime Helicopter Training Centre, which includes two Operational Mission Simulators.
Split into simpler sentences: In addition to Sikorsky, General Dynamics Canada and L-3 MAS, Sikorsky's subcontractors, are responsible for in service maintenance. This includes the Maritime Helicopter Training Centre, with two Operational Mission Simulators.