Complex sentence: After both Hulks get away and regress back to normal, Cho tries to convince Banner that they are heroes but after witnessing Cho nearly lose control in a fight against a sea monster, Banner tells Cho that they are in fact prison guards.
Split into simpler sentences: After both Hulks get away and regress back to normal, Cho tries to convince Banner that they are heroes. However, after witnessing Cho nearly lose control in a fight against a sea monster, Banner tells Cho that they are in fact prison guards.