Complex sentence: Bishop Matthew Wren was a forceful supporter of Charles I; nonetheless Parliamentary recruitment took hold, and a strong Royalist party was stifled by a lack of commitment from the aldermen, and isolation from Royalist-held regions.
Split into simpler sentences: Bishop Matthew Wren was a forceful supporter of Charles I. Nonetheless, Parliamentary recruitment took hold. The strong Royalist party was stifled by a lack of commitment from the aldermen and isolation from Royalist-held regions.