Complex sentence: Goldner later worked in the garment business, before opening a chain of dance halls in New York and New Jersey, which flourished in the late 1940s during the craze for Latin music, a style that Goldner loved.
Split into simpler sentences: Goldner later worked in the garment business, before opening a chain of dance halls in New York and New Jersey. Goldner's dance clubs thrived in the late 1940s during the craze for Latin music, a style that Goldner loved.