Complex sentence: When Scott and Hank completely destroy Pym Technologies'work, Yellowjacket tries to exact revenge by threatening the new Ant-Man's daughter, but Scott stops him by shrinking into the Yellowjacket suit and messing with its functions, resulting in Cross shrinking uncontrollably.
Split into simpler sentences: When Scott and Hank completely destroy Pym Technologies'work, Yellowjacket tries to exact revenge by threatening Scott's daughter. But Scott stops him by shrinking into the Yellowjacket suit and messing with its functions, resulting in Cross shrinking uncontrollably.