Complex sentence: Colonel Banastre Tarleton was sent to capture or kill Marion in November 1780; he despaired of finding the "old swamp fox", who eluded him by travelling along swamp paths.
Split into simpler sentences: Colonel Banastre Tarleton was sent to capture or kill Marion in November 1780. He despaired of finding the "old swamp fox", who eluded him by travelling along swamp paths.