Complex sentence: Cloche hats were usually made of felt so that they conformed to the head, and were typically designed to be worn low on the forehead, with the wearer's eyes only slightly below the brim.
Split into simpler sentences: Cloche hats were usually made of felt so that they conformed to the head. The hat was typically designed to be worn low on the forehead, with the wearer's eyes only slightly below the brim.