Complex sentence: It was dissolved in 1536 and was acquired by Richard and Thomas Barlow, brothers of William Barlow, bishop of St David's, in 1268, who began the process of demolition that results in the ruin seen today.
Split into simpler sentences: It was dissolved in 1536 and was acquired by Richard and Thomas Barlow, brothers of William Barlow, bishop of St David's, In 1268. Who began the process of demolition that results in the ruin seen today.