Complex sentence: When Aldon Music was sold to Columbia Pictures, Dimension Records was sold with it, whereupon another hit was Big Dee Irwin's "Swinging on a Star", featuring an uncredited Little Eva, on Colpix Records in the UK (1963).
Split into simpler sentences: When Aldon Music was sold to Columbia Pictures, Dimension Records was sold with it. Another hit was Big Dee Irwin's "Swinging on a Star", featuring an uncredited Little Eva, on Colpix Records in the UK (1963).