Complex sentence: Between 1885 and 1900, he developed friendships with Wilhelm Leibl, Johann Sperl, Max Liebermann, with the entrepreneurial family Steinbeis (owners and operators of the Wendelstein Rack Railway) and others.
Split into simpler sentences: Between 1885 and 1900, he developed friendships with such people as Wilhelm Leibl, Johann Sperl, Max Liebermann. He also become friends with the entrepreneurial family Steinbeis (owners and operators of the Wendelstein Rack Railway) and others.