Complex sentence: On the basis of this it was judged that both U boats had been destroyed, and skippers Wharton and Crisp were awarded the DSC and an Admiralty bounty, but post war examination of records showed no U-boats sunk that day.
Split into simpler sentences: On the basis of this it was judged she had been destroyed, and Crisp was awarded the DSC and the/an Admiralty bounty. Both U boats were assessed as destroyed, and skippers Wharton and Crisp were awarded DSC and bounty, but post war examination of records showed no U boats sunk that day.