Complex sentence: This work with Freddie Young was from the roles of Clapper/Loader in the late 60's, through Focus Puller, Operator, and finally up to Freddie's retirement in the mid 80s: photographing his 2nd Units.
Split into simpler sentences: This work with Freddie Young was from the roles of clapper/loader in the late 1960s, through focus puller and operator. In the years up to Freddie's retirement in the mid 1980s Trevor was photographing his 2nd units.