Simplify the following text for a Grade 9 native English-speaking person.
Original: The contract also stipulated that the film would be `` non-political , '' that immediately available funding came from Mrs. Sinclair in an amount of `` not less than Twenty-Five Thousand Dollars , '' that the shooting schedule amounted to `` a period of from three to four months , '' and most importantly that `` Eisenstein furthermore agrees that all pictures made or directed by him in Mexico , all negative film and positive prints , and all story and ideas embodied in said Mexican picture , will be the property of Mrs. Sinclair ... '' A codicil to the contract , dated December 1 , allowed that the `` Soviet Government may have the ( finished ) film free for showing inside the U.S.S.R. '' Reportedly , it was verbally clarified that the expectation was for a finished film of about an hour 's duration .
Simplified: The schedule for making the movie would be `` a period of from three to four months , '' . The contract also said that `` Eisenstein ... agrees that all pictures made or directed by him in Mexico , all negative film and positive prints , and all story and ideas embodied in said Mexican picture , will be the property of Mrs. Sinclair ... '' An addition to the contract , dated December 1 , allowed that the `` Soviet Government may have the ( finished ) film free for showing inside the U.S.S.R. '' Reportedly , it was verbally decided that the film was expected to be an hour long .