Complex sentence: He is best known as the lead guitarist of the Tejano band Selena y Los Dinos, which whom he married to the lead frontwoman of the group, Selena on April 2,1992.
Split into simpler sentences: He is best known as the lead guitarist of the Tejano band Selena y Los Dinos. He married the lead frontwoman of the group, Selena, on April 2,1992.