Complex sentence: According to the United Kingdom Census 2001 there were 8,037 people living in Pontprennau, however this has expanded greatly since due to sustained housing development both in West Pontprennau and on further pieces of unused land.
Split into simpler sentences: According to the United Kingdom Census 2001, there were 8,037 people living in Pontprennau. However, this has expanded greatly since, due to sustained housing development both in West Pontprennau and on further pieces of unused land.