Complex sentence: He has said that he can write music in any genre, as long as he is motivated, and has also stated that when I write a song, the time it takes me depends on whether I know the singer's natural voice.
Split into simpler sentences: He has said that he can write music in any genre, as long as he is motivated. He also stated that when I write a song, the time it takes me depends on whether I know the singer's natural voice.