Complex sentence: When "Skins" came back in 2009 for a third series only she and Kaya Scodelario remained from the old cast and they were joined by a whole new cast for thethird series that premiered on 22 January 2009 in the United Kingdom.
Split into simpler sentences: When "Skins" returned in 2009 for a third series, only she and Kaya Scodelario remained from the old cast. Thereafter, they were joined by a new cast for the third series, which premiered on 22 January 2009 in the United Kingdom.