Complex sentence: In May 1689, Lahontan is issued with orders to march from For Michilimackinac to the Great Lakes and explore the water ways during which time he has encounters with the Hurons at Fort St. Joseph.
Split into simpler sentences: In May 1689, Lahontan is issued with orders to march from For Michilimackinac to the Great Lakes and explore the waterways. During this journey, he has encounters with the Hurons at Fort St. Joseph.