Complex sentence: Selwyn has, in recent times, excelled academically, and is ranked 1st out of 29 undergraduate Cambridge Colleges in the 2008 Tompkins Table (4th in 2007,7th in 2006).
Split into simpler sentences: Selwyn has, in recent times, excelled academically. In 2008, Selwyn was ranked 1st out of the 29 undergraduate colleges which admit undergraduate students on the Tompkins Table (4th in 2007,7th in 2006).