Complex sentence: The Continental Congress created the Continental Association, an agreement to boycott British goods and, if that did not get the Coercive Acts reversed after a year, to stop exporting goods to Great Britain as well.
Split into simpler sentences: The Continental Congress created the Continental Association, an agreement to boycott British goods. Additionally, it was decided that if the Coercive Acts were not reversed after a year, goods were to stop being exported to Great Britain as well.