Complex sentence: These superior numbers did not always equate with easy success and more desperate tactics had to be used, as historian M. Greengrass tells us Catholics had particular difficulty in the rue des Couteliers and towards the Daurade church, an artisan quarter where Huguenot support was strong.
Split into simpler sentences: These superior numbers did not always equate with easy success and more desperate tactics had to be used. Greengrass writes: Catholics had particular difficulty in the rue des Couteliers and towards the Daurade church, an artisan quarter where Huguenot support was strong.