Complex sentence: Manchester's fortunes decreased in the subsequent years after WW2 due to deindustrialisation however investment in the last two decades spurred by the IRA's 1996 Manchester bombing-which was the largest bomb ever detonated in peacetime Britain-spearheaded extensive regeneration of Manchester.
Split into simpler sentences: Manchester's fortunes decreased in the subsequent years after WW2 due to deindustrialisation. However, investment in the last two decades, spurred by the IRA's 1996 Manchester bombing-which was the largest bomb ever detonated in peacetime Britain-spearheaded extensive regeneration of Manchester.