Complex sentence: The recession is expected to drive them all back to London with their tails between their legs within a few years, which will safeguard what is left of the once vibrant local trade, and replace the Chelsea tractors with horses and carts.
Split into simpler sentences: The recession is expected to drive them all back to London with their tails between their legs within a few years. This is expected to safeguard the once vibrant local trade, and replace the Chelsea tractors with horses and carts.