Complex sentence: Early models of the Royale featured a Tecumseh built horizontal shaft engine with recoil start, however as the time went by the engines in the subsequent models were Briggs and Statton made, with an electric start option introduced during the 1980s.
Split into simpler sentences: Early models of the Royale featured a Tecumseh--built horizontal shaft engine with recoil start. Engines in later models were from Briggs and Statton, with an electric start option introduced during the 1980s.