Complex sentence: Wikimedia UK (WMUK) is a registered charity established to support volunteers in the United Kingdom who work on Wikimedia projects such as Wikipedia, and it is a Wikimedia chapter approved by the Wikimedia Foundation which hosts and owns those projects.
Split into simpler sentences: Wikimedia UK (WMUK) is a registered charity established to support volunteers in the United Kingdom who work on Wikimedia projects such as Wikipedia. As such, it is a Wikimedia chapter approved by the Wikimedia Foundation which owns and hosts those projects.