Complex sentence: Less than a month after Wood's conviction, the Hungerford massacre took place in which Michael Robert Ryan killed 16 people, prompting Parliament to pass the Firearms (Amendment) Act 1988 which banned civilian ownership of nearly all semi-automatic weapons.
Split into simpler sentences: Less than a month after Wood's conviction, the Hungerford massacre took place, where Michael Robert Ryan killed 16 people. This prompted Parliament to pass the Firearms (Amendment) Act 1988, which banned civilian ownership of nearly all semi-automatic weapons.