Complex sentence: Utkin retired in 2013 and began working for private company "Moran Security Group" founded by Russian military veterans; the company performed security and training missions around the world, specializing in security against piracy.
Split into simpler sentences: Utkin retired in 2013 and began working for the private company called the "Moran Security Group", which was founded by Russian military veterans. The company performed security and training missions around the world, specializing in security against piracy.