Complex sentence: While with the Hi-Fives, Brigati began collaborating with Joseph DiNicola (Joey Dee) of nearby Passaic, New Jersey, who sang back-up on a few of the Hi-Five recordings.
Split into simpler sentences: While with the Hi-Fives, David first collaborated with Joseph DiNicola (Joey Dee) of nearby Passaic, New Jersey. Dee actually sang back up on a few of the Hi-Five recordings.