I've heard that Rush drummer Neil Peart takes trips to Africa to collect drums 'n' such, and he uses a lot of African polyrhythms in his own drumming. Then again, this has nothing to do with jazz or saxophones, but rather with the drumming techniques of one of the greatest progressive rock bands of all time.

your best best would be to actually listen to african music, I would think. it might be a good idea to check out a compilation of the traditional music of one particular culture (say, Ghanan music or the music of Mali). Although there's plenty of great afropop/afrobeat music out there, and plenty of bands that skirt the edges of traditional african music, traditional music is typically going to have more rhythmic complexity.