Complex sentence: Wilson's mint cake was founded in 1915 when James Wilson purchased a factory in the stricklandgate area of the town, he had previously made and distibuted types of toffee, but he decided to concentrate on mint cake.
Split into simpler sentences: Wilson's mint cake was founded in 1915 when James Wilson purchased a factory in the stricklandgate area of the town. He had previously made and distributed types of toffee, but he decided to concentrate on mint cake.