Complex sentence: HSBC's UK headquarters are at 8 Canada Square in the Canary Wharf area of East London, this building is also home to HSBC Holdings plc's headquarters, and houses some 8,000 staff over 45 levels.
Split into simpler sentences: HSBC's UK headquarters are at 8 Canada Square in the Canary Wharf area of East London. This building is also home to HSBC Holdings plc's headquarters, and houses some 8,000 staff over 45 levels.