Complex sentence: One tornado touched down just north of Stratford, Ontario, it was an F1 and caused moderate damage and a second one near Collingwood occurred late Sunday evening also rated F1 with a storage shed completely destroyed.
Split into simpler sentences: One tornado touched down just north of Stratford, Ontario; it was an F1 and caused moderate damage. A second tornado near Collingwood occurred late Sunday evening and also rated F1, with a storage shed completely destroyed.