Complex sentence: One third of the site was recently destroyed during the completion of M50 motorway extension.However the junction which had been the real focus of conservationists ire, was also subsequently completed-decimating the remainder of site in the process.
Split into simpler sentences: One third of the site was recently destroyed during the completion of M50 motorway extension. Subsequently, the junction which had been the focus of conservationists ire, was also completed-decimating the remainder of site in the process.