Complex sentence: Cortejo Afro and Batala are symbiotic sharing much of the same repertoire and members of Batala, have since 1999, performed every year at the Salvador Carnaval as part of Cortejo Afro.
Split into simpler sentences: Cortejo Afro and Batala are symbiotic sharing much of the same repertoire. Members of Batala have since 1999 performed every year at the Salvador Carnival as part of Cortejo Afro.