Complex sentence: Gardner fought in the second Seminole War in Florida against the various Seminole Indian tribes between 1835 and 1839, including at the Battle of Wahoo Swamp on November 21,1836.
Split into simpler sentences: Gardner fought in the second Seminole Wars in Florida against the various Seminole Indian tribes in 1835--1839. He fought at the Battle of Wahoo Swamp on November 21,1836.