Complex sentence: Bob Morales and Connie Valenzuela even came to the set to help the actors portray their characters correctly, and Connie even makes an appearance as an older lady sitting next to Ritchie at the family's first party.
Split into simpler sentences: Bob Morales and Connie Valenzuela even came to the set to help the actors portray their characters correctly. Ritchie Valens'mother, Connie Valenzuela, makes an appearance as an older lady sitting next to Ritchie at the family's first party.