Complex sentence: In 1836 he decided to move to the United States to become a missionary among the Native Americans, and traveled to New York with a group led by Bishop Simon Bruté, the first bishop of the Catholic Diocese of Vincennes.
Split into simpler sentences: In 1836 he decided to move to the United States to become a missionary among the Native Americans. Petit traveled to New York with a group led by Bishop Simon Bruté, the first bishop of the Catholic Diocese of Vincennes.