Complex sentence: At the Clock Tower, Jill summons the helicopter by ringing the Clock Tower's bell before being confronted by Nemesis, which destroys the helicopter and infects Jill with the T-virus.
Split into simpler sentences: At the Clock Tower, Jill manages to summon the helicopter by ringing the Clock Tower's bell. However, Nemesis eventually destroys the helicopter and infects Jill with the T-virus.