Complex sentence: The film was a box office bomb grossing only $1 million and received generally negative reviews from some critics, and was considered by many to be among the worst films ever made, and among the worst films ever made by Marvel Entertainment.
Split into simpler sentences: The film was a box office bomb grossing only $1 million and received generally negative reviews from critics. It was considered by many to be among the worst films ever made, and among the worst films ever made by Marvel Entertainment.