Complex sentence: Plans were made in the 1960s to replace the substandard housing in Notting Dale, displacing 3,000 people which were to be accommodated in the Lancaster West Estate scheme which included an office complex and a shopping centre which were never built.
Split into simpler sentences: Plans were made in the 1960s to replace the substandard housing in Notting Dale. This would displace 3,000 people which were to be accommodated in the Lancaster West Estate scheme which included an office complex and a shopping centre that were never built.