Complex sentence: Heinrich Escher later returned to Switzerland where his son, Alfred Escher, founded the Zurich Polytechnic school, and was also one of the co-founders of the Schweizerische Kreditanstalt, later named Credit Suisse.
Split into simpler sentences: Heinrich Escher later returned to Switzerland where his son, Alfred Escher, founded the Zurich Polytechnic school. He was also one of the co-founders of the Schweizerische Kreditanstalt, later named Credit Suisse.