Complex sentence: The 7th contains some of the most conservative counties in the state and also the state's most rural district; many DFLers outside the Twin Cities are hunters and trappers who oppose gun control.
Split into simpler sentences: The 7th contains some of the most conservative counties in the state. As previously mentioned, it is also the state's most rural district; many DFLers outside the Twin Cities are hunters and trappers who oppose gun control.