Complex sentence: The estate was designed in 1967 as part of a major Royal Borough of Kensington and Chelsea redevelopment scheme and opened in the mid 1970s, and was composed of one tower block of 23 stories and 900 other units.
Split into simpler sentences: The estate was designed in 1967 as part of a major Royal Borough of Kensington and Chelsea redevelopment scheme. It opened in the mid 1970s, and was composed of one tower block of 23 stories and 900 other units.