Complex sentence: At the close of the Telethon at the National Stadium, presented the group Los Prisioneros, who changed the lyrics of the song "Quieren Dinero" (Eng.: They want money).
Split into simpler sentences: At the close of the Telethon at the National Stadium, the group Los Prisioneros were introduced. They changed the lyrics of the song "Quieren Dinero" (Eng.: They want money).