Complex sentence: Ralph Mercado Jr. (September 29,1941--March 10,2009) was born in Brooklyn to a Puerto Rican mother and Dominican father, Mr. Mercado began in the music business as a teenager, organizing parties and dances as president of a neighborhood social club.
Split into simpler sentences: Ralph Mercado Jr. (September 29,1941--March 10,2009) was born in Brooklyn to a Puerto Rican mother and Dominican father. He entered the music business as a teenager, organizing parties and dances as president of a neighborhood social club.