Complex sentence: On the journey north to Nootka Sound along the coast Gray encountered a strong outflow near 46 "16" which he then spent nine days trying to enter without success before abandoning the effort and sailing north for Nootka.
Split into simpler sentences: On the journey north along the coast to Nootka Sound, Gray encountered a strong outflow near 46 "16". He spent nine days trying to enter the river without success before abandoning the effort and sailing north for Nootka.