Complex sentence: Edward I's campaign of castle-building in Wales cost £80,000 between 1277 and 1304, and £95,000 between 1277 and 1329; by 1292 £12,000 had been spent on the construction of Caernarfon's castleof which the southern facade was furthest alongand town walls.
Split into simpler sentences: Edward I's campaign of castle-building in Wales cost £80,000 between 1277 and 1304, and £95,000 between 1277 and 1329;. By 1292 £12,000 had been spent on the construction of Caernarfon's castleof which the southern facade was furthest alongand town walls.