Complex sentence: The Skymonster is based on the Canadair CL-44 freighter (itself a derivative of the Bristol Britannia), and features an enlarged fuselage, like the Mini Guppy which was produced by Jack Conroy's previous company, Aero Spacelines.
Split into simpler sentences: The Skymonster is based on the Canadair CL-44 freighter (itself a derivative of the Bristol Britannia). It features an enlarged fuselage, like the Mini Guppy which was produced by Jack Conroy's previous company, Aero Spacelines.