Complex sentence: He graduated in 1975 Moscow school number 637, after unsuccessful attempts to enter the school in the Boris Shchukin Theatre Institute School worked for a year assistant illuminator in the lower park osvetitelskogo department at "Mosfilm".
Split into simpler sentences: He graduated in 1975 from Moscow school number 637, after unsuccessful attempts to enter the school in the Boris Shchukin Theatre Institute School. He worked for a year as assistant illuminator in the lower park osvetitelskogo department at "Mosfilm".