Complex sentence: A new addition to the team was Walter "Flipper Dipper" (or "Flippa Dippa") Johnson Jr., an Afro-American boy, and the son of another member of the Project.
Split into simpler sentences: A new addition to the team was Walter "Flipper Dipper" (or "Flippa Dippa") Johnson Jr., an Afro-American boy. He is also the son of another member of the Project.