Complex sentence: Edmonds was hampered by a fire at Walworth in a 1942 air raid, that burnt many of the records and at Aberystwyth was isolated from the libraries of London and short of researchers.
Split into simpler sentences: Edmonds was hampered by a 1942 air raid, that burnt many of the records stored at Walworth. At Aberystwyth Edmonds was isolated from the libraries of London and short of researchers.