Complex sentence: An avid and lifelong (with intervals) stamp collector, ED became interested in the philately of the Falkland Islands when he visited there in 2005, and his collecting now focuses primarily on stamps from that area.
Split into simpler sentences: An avid and lifelong (with intervals) stamp collector, Denson became interested in the philately of the Falkland Islands when he visited there in 2005. His collecting now focuses primarily on stamps from that area.