Complex sentence: A former U.S. Army medical doctor and scientist before the worldwide plague, he loses his wife and daughter in a helicopter crash shortly after Manhattan is quarantined, and spends the next three years trying to find a cure while defending himself against the Darkseekers.
Split into simpler sentences: A former U.S. Army medical doctor and scientist before the worldwide plague. He loses his wife and daughter in a helicopter crash shortly after Manhattan is quarantined and spends the next three years trying to find a cure while defending himself against the Darkseekers.