Complex sentence: The original band consisted of the eight oldest children of Maikeli "Mike" and Vaké Wolfgramm, who have 17 children in total, fifteen by birth and two (Eddie and Eugene) by adoption, were originally from the South Pacific island kingdom of Tonga.
Split into simpler sentences: The original band consisted of the eight oldest children of Maikeli "Mike" and Vaké Wolfgramm. Mike and Vaké, who have 17 children in total, fifteen by birth and two (Eddie and Eugene) by adoption, are originally from the South Pacific island kingdom of Tonga.