Complex sentence: Richmond London Borough Council applied for the main Victorian wing of the building to be listed as a site of special Architectural or Historic Interest but English Heritage subsequently completed an assessment of the house and concluded that the property was not suitable for listed building status.
Split into simpler sentences: Richmond London Borough Council applied for the main Victorian wing of the building to be listed as a site of special Architectural or Historic Interest. However English Heritage subsequently completed an assessment of the house and concluded that the property was not suitable for listed building status.