Complex sentence: Warmouth are found throughout much of the south in the Mississippi River drainage, from the Gulf and Atlantic coasts and northward to the Chesapeake Bay, and westward throughout Texas to the Rio Grande, and northward into the Great Lakes basin area.
Split into simpler sentences: Warmouth are found throughout much of the south in the Mississippi River drainage; existing all the way to the Gulf and Atlantic Coasts and Northward to the Chesapeake Bay. As well as being found westward throughout Texas to the Rio Grande, and northward into the Great Lakes basin area.