Complex sentence: Their breeding habitat is lakes, ponds, rivers, marshes and other aquatic environments in eastern Canada including the Great Lakes, and the Adirondacks in the U.S. Black Ducks interbreed regularly and extensively with Mallard ducks, to which they are closely related.
Split into simpler sentences: Their breeding habitat is lakes, ponds, rivers, marshes and other aquatic environments in eastern Canada including the Great Lakes, and the Adirondacks in the US. Black ducks interbreed regularly and extensively with Mallard ducks, to which they are closely related.