Complex sentence: In 1836 the help their friend John Greenlee and his family escape from Campbeltown and set him up in the cabin in the Argyle Settlement and embarked in merchandising there and subsequently he lived in Joliet and Lockport, following the same business.
Split into simpler sentences: In 1836 they helped their friend John Greenlee and his family escape from Campbeltown and set him up in the cabin in the Argyle Settlement and embarked in merchandising there. Subsequently Armour lived in Joliet and Lockport, following the same business.