Complex sentence: In 1971 and 1972 Arctic Cat produced snowmobiles powered by 303 cc Wankel rotary engines manufactured by Sachs in Germany, and also these days, Johnson and other brands sold Snowmobiles powered by 35 or 45 HP RCEs designed and built by OMC.
Split into simpler sentences: In 1971 and 1972 Arctic Cat produced snowmobiles powered by 303 cc Wankel rotary engines manufactured by Sachs in Germany. In the early 1970s Johnson and other brands sold Snowmobiles powered by 35 or 45 HP Wankel engines designed and built by OMC.