Complex sentence: Muhammad Sven Kalisch, a Muslim convert and Germany's first professor of Islamic theology, has expressed the view that "the Prophet Muhammad probably never existed" based on his study of multiple evidences.
Split into simpler sentences: Muhammad Sven Kalisch, a Muslim convert and Germany's first professor of Islamic theology. He too is a scholar who has expressed the view that "the Prophet Muhammad probably never existed" based on his study of multiple evidences.