Simplify the following text for a Grade 9 native English-speaking person.
Original: On October 23 , 1930 , by `` mutual consent , '' Paramount and Eisenstein declared their contract null and void , and the Eisenstein party were treated to return tickets to Moscow at Paramount 's expense .
Simplified: On October 23 , 1930 , Paramount and Eisenstein declared their contract canceled . Eisenstein and his film partners were given return tickets to Moscow , at Paramount 's expense .