Complex sentence: Actor Geoffrey Rush stated in interviews that the film was itself structured to be reminiscent of a Peter Sellers film, however, it was darker than Sellers'actual films since it depicted Sellers' troubled experiences in his life (including his tantrums and mental instability).
Split into simpler sentences: Actor Geoffrey Rush stated in interviews that the film was itself structured to be reminiscent of a Peter Sellers film. However, it was darker than Sellers'actual films since it depicted Sellers' troubled experiences in his life (including his tantrums and mental instability).