Complex sentence: The company became a notable distributor of Rickenbacker guitars in the 1960s due to the Beatles playing them, and British models carry unique serial numbers such as the 325 becoming the Rose Morris 1996.
Split into simpler sentences: The company became a notable distributor of Rickenbacker guitars in the 1960s when the Beatles played them. The British models carry unique serial numbers such as the 325, the Rose Morris 1996.