Complex sentence: In old school hip hop, Kool Moe Dee says that improvisational rapping was instead called "coming off the top of the head", and he refers to this as "the real old-school freestyle".
Split into simpler sentences: In old school hip hop, Kool Moe Dee says that improvisational rapping was instead called "coming off the top of the head". He refers to this as "the real old-school freestyle".