Complex sentence: His first course of action there in Lima was to observe the Order of Preachers, indicating an active interest in joining in order to serve God in agreement with a vision he had 20 years ago to go to Peru.
Split into simpler sentences: His first course of action there in Lima was to observe the Order of Preachers, indicating an active interest in joining in order to serve God. This was an in line with a vision he had 20 years ago commanding him to travel to Peru.