Complex sentence: Runyon's girlfriend Kulhammer forced Steel to agree to save capture the Gadgeteer in return for Runyon doing this which he agreed to, however afterwards Kulhammer revealed to Runyon that she didn't intend to honor the agreement as she felt it would ruin the newspaper.
Split into simpler sentences: Runyon's girlfriend Kulhammer forced Steel to agree to save capture the Gadgeteer in return. Heywood agreed to this, however afterwards Kulhammer revealed to Runyon that she didn't intend to honor the agreement as she felt it would ruin the newspaper.