Complex sentence: It consisted of a chapel arches, an altar not in conformity with the canonical norms and separated by a wall and a round window on the front but did not have a holy stone, a bell and vestments.
Split into simpler sentences: It consisted of a chapel arches, an altar separated by a wall not in conformity with the canonical norms and a round window on the front. It did not have a holy stone, a bell and vestments.