Complex sentence: He served under Benedict Arnold at the Battle of Valcour Island in Lake Champlain on October 11,1776 when was in command of the two-masted schooner Royal Savage with had a crew of 50 men.
Split into simpler sentences: He served under Benedict Arnold at the Battle of Valcour Island on Lake Champlain on October 11,1776. Hawley commanded the two-masted schooner Royal Savage with a crew of 50 men.