Complex sentence: In 1995 the two brothers purchased a controlling interest in the British film studio, Shepperton Studios, which in 2001 merged with Pinewood Studios to become The Pinewood Studios Group which is headquartered in Buckinghamshire, England.
Split into simpler sentences: In 1995 the two brothers purchased a controlling interest in the British film studio Shepperton Studios. In 2001, Shepperton merged with Pinewood Studios to become The Pinewood Studios Group, which is headquartered in Buckinghamshire, England.