Complex sentence: They strongly contested Butler's claims of pushing Genie too hard, contending that she enjoyed the tests and that they allowed her to take breaks at will, and both Curtiss and Kent emphatically denied Butler's accusations towards them.
Split into simpler sentences: They strongly contested Butler's claims of pushing Genie too hard, contending that she enjoyed the tests and that they allowed her to take breaks at will. Both Curtiss and Kent emphatically denied Butler's accusations towards them.