Complex sentence: On September 13,1781, the settlers abandoned the undermanned station and headed for nearby Linn's Station, however Squire Boone was still too weak from his injury to make the trip, staying behind at Painted Stone Station with his family and one other.
Split into simpler sentences: On September 13,1781, the settlers abandoned the undermanned station and headed for nearby Linn's Station. Since Squire Boone was still too weak from his injury to make the trip, he stayed behind at the station with his family and one other.