Complex sentence: Historically, the word'Puritan' was used pejoratively to characterize the Protestant group as extremists, similar to the Cathars of France, and according to Thomas Fuller in his "Church History", dated back to 1564.
Split into simpler sentences: Historically, the word'Puritan' was considered a pejorative term that characterized Protestant groups as extremists, similar to the Cathars of France. According to Thomas Fuller, writing in his "Church History", the term dates to 1564.