Complex sentence: The rebooted Terminator arrives a few minutes later in a second helicopter which crashes into the T-X, ripping it in half, but it still attempts to drag itself inside the bunker and follow John and Kate.
Split into simpler sentences: The rebooted Terminator arrives a few minutes later in a second helicopter which crashes into the T-X, ripping it in half. The T-X pulls itself from the wreckage and attempts to drag itself inside the bunker and follow John and Kate.