Complex sentence: Heinz Nixdorf was an ambitious sportsman, and as he wanted his employees to do sports as well, he built the Ahorn-Sportpark in Paderborn right next to the company's central office.
Split into simpler sentences: Heinz Nixdorf was an ambitious sportsman so he wanted his employees to do sports as well. Because of that he build the Ahorn-Sportpark in Paderborn, which was right next to the central office.