Complex sentence: Vickers purchased the site in 1946 for £330,000 which allowed them after the war produce civilian aircraft the most notable of these being the Vickers Viscount of which 444 were built between Brooklands and Bournemouth.
Split into simpler sentences: Vickers purchased the site in 1946 for £330,000, which allowed them to produce civilian aircraft. The most notable of these was the Vickers Viscount, of which 444 were built between Brooklands and Bournemouth.