Complex sentence: In the early 1990s, South African-born producer Chris du Plessis made a documentary film, "The Whistlers", about the music, and as a result the original members of Alex Black Mambazo reunited to perform in clubs.
Split into simpler sentences: In the early 1990s, South African-born producer Chris du Plessis made a documentary film, "The Whistlers", about the music. Subsequently, the original members of Alex Black Mambazo reunited to perform in clubs.