Complex sentence: As a painter Maxim Kantor, who states that "he didn't want to study under anybody and his father (the philosopher Karl Kantor) was all he needed" was deeply influenced by Michelangelo, Mantegna, Goya and Petrov Vodkin.
Split into simpler sentences: As a painter Maxim Kantor "didn't want to study under anybody and his father (the philosopher Karl Kantor) was all he needed". However, he was deeply influenced by Michelangelo, Mantegna, Goya and Petrov Vodkin.