Complex sentence: As 3 year olds Mummy's Pet and Swing Easy remained at sprinting and, among other successes won between them were the Sceptre Stakes, Temple Stakes, Daniel Prenn, Kings Stand Stakes and the Nunthorpe Stakes.
Split into simpler sentences: As 3 year olds Mummy's Pet and Swing Easy remained at sprinting. Among other successes they won between them the Sceptre Stakes, Temple Stakes, Daniel Prenn, Kings Stand Stakes and the Nunthorpe Stakes.