Complex sentence: Each year, the Podunks burned the undergrowth as part of the normal'forest management' that they practiced; wood was also used for heating purposes and settlers cut down any large trees for firewood.
Split into simpler sentences: Each year, the Podunks burned the undergrowth as part of the normal'forest management' that they practiced. Also, wood was used for heating purposes and the settlers cut down any large trees for firewood.