Complex sentence: Enlisting in the Continental Army at the age of sixteen, he fought at Brandywine and in the Virginia campaign, and was present at Charles Cornwallis' surrender, receiving an honorable discharge signed by George Washington on June 12,1784.
Split into simpler sentences: Enlisting in the Continental Army at the age of sixteen, Cooke fought at Brandywine and in the Virginia campaign, and was present at Charles Cornwallis' surrender. He received an honorable discharge signed by George Washington on June 12,1784.