Complex sentence: Originally from Germany, Gastauer founded his first business, an asset management firm in 1998, a company he would go on to sell and later found the German online payment processing company, Apax Global Payments in 2002.
Split into simpler sentences: Originally from Germany, Gastauer founded his first business, an asset management firm in 1998. He would go on to sell this company and later found the German online payment processing company Apax Global Payments in 2002.