Complex sentence: Hermann Klaatsch had relied on a neo-Lamarckian model of evolution to try and explain to origin of bipedalism, Klaatch's model had claimed that human races had evolved independent of eachother, his model had influenced the belief of polygenism.
Split into simpler sentences: Hermann Klaatsch had relied on a neo-Lamarckian model of evolution to try and explain to origin of bipedalism. Klaatsch's model had claimed that human races had evolved independent of eachother, his model had influenced the belief of polygenism.