Complex sentence: John was also present with Gen. Carlton's naval squadron on Lake Champlain at the Battle of Valcour Island on October 11 1776 as Benedict Arnold's American navel squadron was defeated.
Split into simpler sentences: John was also present with Gen. Carlton's naval squadron on Lake Champlain at the Battle of Valcour Island on October 11 1776. As Benedict Arnold's American navel squadron was defeated.