Complex sentence: Frank Martin (Jason Statham) is a little known yet highly regarded and highly skilled driver who has retired from special forces service with a new (secret) pastime where he is known only as "The Transporter".
Split into simpler sentences: Frank Martin (Jason Statham) is a little known yet highly regarded and highly skilled driver who has retired from special forces service with a new pastime. In this secret pastime, he is known only as "The Transporter".