Complex sentence: Following the sale of that company, he purchased a small chainsaw company founded by Claude Poulan and his brothers, renamed it Beaird-Poulan, and built it into the fourth largest maker of chainsaws in the world.
Split into simpler sentences: Following the sale of that company, Beaird purchased a small chainsaw company founded by Claude Poulan and his brothers and renamed it Beaird-Poulan. He built it into the fourth largest maker of chainsaws in the world.