Complex sentence: Ernest Thomas fled the county and avoided arrest for several days until a Sheriff's posse of over 1000 armed men, shot and killed him about 200 miles northwest during a lengthy chase through the swamps.
Split into simpler sentences: Ernest Thomas fled the county and avoided arrest for several days. A Sheriff's posse of over 1000 armed men, found, shot and killed him about 200 miles northwest during a lengthy chase through the swamps.