Complex sentence: The Mere supports a diverse fish population and large numbers of wintering and breeding wildfowl, including breeding Eurasian Curlew and Common Snipe, and, together wit the surrounding land, is important for its botanical and invertebrate communities.
Split into simpler sentences: The Mere supports diverse fish and bird populations, including large numbers of wintering and breeding wildfowl and breeding Eurasian Curlew and Common Snipe. Together with the surrounding land, it is also important for its botanical and invertebrate communities.