Complex sentence: Its founding would not occur until 13 July 1059 by Dom Gomes Aciegas, and completed 1102; the remains of this original construction are two small chapels (below the main altar), the mail entrance door and the four fortified arches.
Split into simpler sentences: Its founding would not occur until 13 July 1059 by Dom Gomes Aciegas, and completed 1102. All that remains of the original construction are two small chapels (below the main altar), the mail entrance door and the four fortified arches.