Complex sentence: On 31 August 2007 Andrew Foster supported Hard-Fi as they were Number One in the UK Official Charts the gig promoted the release of their second studio album Once Upon a Time in the West and was played at South Parade Pier in Portsmouth.
Split into simpler sentences: On 31 August 2007, Foster supported Hard-Fi as they were Number One in the UK Official Charts. The gig promoted the release of their second studio album "Once Upon a Time in the West" and was played at South Parade Pier in Portsmouth.