Complex sentence: Dietrich Mateschitz (born 20 May 1944) is an Austrian businessman, who cofounded the energy drink producer Red Bull, and holds 49 percent of the company's shares.
Split into simpler sentences: Dietrich Mateschitz (born 20 May 1944) is an Austrian businessman. Mateschitz is a cofounder of the energy drink producer Red Bull, and holds 49 percent of the company's shares.