Original sentence: However much more was destroyed by speculative builders, slum clearance schemes and modernization, than that razed by Nazi bombing.Plymouth had many medieval, Jacobean, Regency and Victorian buildings, some of which had survived the war
Edited sentence: However much more was destroyed by speculative builders, slum clearance schemes and ephemeral attempts at modernizing, than even the huge swathes razed by Nazi bombing.Plymouth had a fascinating and rich core of medieval, Jacobean, Regency and Victorian buildings,many of which had survived until the late nineteenth century, the early twentieth and even some into the post war era.the debates about the merits or otherwise of the first and subsequent efforts to  resurrect the  best of the previous times continues