Complex sentence: With some of his friends, Mowat created the Beaver Club of Amateur Naturalists.And kept a museum in the Mowat basement, which included the joined skull of a two-headed calf, some stuffed birds and a bear cub.
Split into simpler sentences: With some of his friends, Mowat created the Beaver Club of Amateur Naturalists. He kept a museum in the Mowat basement, which included the joined skull of a two-headed calf, some stuffed birds and a bear cub.