Original sentence: Aug 3 - Clark arrives at confluence of Missouri and Yellowstone Rivers-moves down river because of mosquiters.Bitterroot Mountains still covered in snow cannot cross.July 13 – Reached White Bear Islands.July 7 – Lewis's group crosses the Continental Divide at Lewis and Clark Pass
Edited sentence: Aug 3 - Clark arrives at confluence of Missouri and Yellowstone Rivers-moves down river because of mosquitoes.Bitterroot Mountains still covered in snow; cannot cross.July 13 – Reached White Bear Island.July 7 – Lewis' group crosses the Continental Divide at Lewis and Clark Pass