Complex sentence: Each of the two finalists, Simon and Kristina, must put together a proposal for the redevelopment of a site currently occupied by the IBM Building on London's South Bank; this site was purchased for £120m by Sir Alan Sugar.
Split into simpler sentences: Each of the two finalists, Simon and Kristina, must put together a proposal for the redevelopment of a site currently occupied by the IBM Building on London's South Bank. This site was purchased for £120m by Sir Alan Sugar.