Simplify the following text for a Grade 8 native English-speaking person.
Original: The trip to Mexico was for Eisenstein to make a film produced by Sinclair and his wife , Mary Craig Kimbrough Sinclair , and three other investors organized as the `` Mexican Film Trust '' .
Simplified: He also received permission for Eisenstein to travel to Mexico to make a film to be produced by Sinclair and his wife , Mary Craig Kimbrough Sinclair . They joined with three other investors to make the Mexican Film Trust .