Complex sentence: Mattera is a former police officer/administrator and has spent over a two decades, named as one of the highest paid executive protection bodyguards in the industry working in over forty countries, with a client list of the who's who of the rich and famous.
Split into simpler sentences: Mattera is a former police officer/administrator and has spent over a two decades as one of the highest paid executive protection bodyguards working in over forty countries. With a client list of the who's who of the rich and famous.