Complex sentence: Due to the expansion of Tavistock in recent years, the two settlements have joined and Whitchurch is now considered part of Tavistock, but historically, Whitchurch formed part of the Roborough Hundred.
Split into simpler sentences: Due to the expansion of Tavistock in recent years, the two settlements have joined, and Whitchurch is now considered part of Tavistock. Historically, Whitchurch formed part of the Roborough Hundred.