Complex sentence: Olatunji won a following among jazz musicians, notably creating a strong relationship with John Coltrane, with whose help he founded the Olatunji Center for African Culture in Harlem.
Split into simpler sentences: Olatunji won a following among jazz musicians, notably creating a strong relationship with John Coltrane. With Coltrane's help, he founded the Olatunji Center for African Culture in Harlem.