Complex sentence: The structure was sold to Washington DC-based A&A Investments in 2006 for £20.5 million, after previous owners Stockbourne had occupied the building for 12 months.
Split into simpler sentences: The structure was sold to Washington DC-based A&A Investments. Since then, A&A Investments bought the building in 2006 for £20.5 million, after previous owners Stockbourne had occupied the building for 12 months.