Complex sentence: Kekele was a band, formed in 2000, composed of veteran top Congolese musicians that played Congolese rumba in a revival style hearkening back to the 1950s and 60s.
Split into simpler sentences: Kekele was a band, formed in 2000, composed of veteran top Congolese musicians. It played Congolese rumba in a revival style hearkening back to the 1950s and 60s.