Complex sentence: In 2010 The Co-operative Group rebranded the Penrith branch of Somerfield as a Co-operative Food store this store closed in 2015 and so for a while Penrith had two Co-op stores owned by two separate societies.
Split into simpler sentences: In 2010 the Co-operative Group rebranded the Penrith branch of Somerfield as a Co-operative Food store. Until 2015, when the store closed, Penrith had two Co-op stores owned by two separate societies.