Complex sentence: On the simple end was a well faired cockpit, the absence of struts and other draggy supports on the tail, and fully retractable gear (including the tailwheel) which were completely enclosed in flight.
Split into simpler sentences: On the simple end was a well faired cockpit, the absence of struts and other drag enducing supports on the tail. A fully retractable gear (including the tailwheel) was completely enclosed in flight.