Complex sentence: The nest's queen and egg chamber are then destroyed with flamethrowers after a short but fierce battle, but the senior Dr. Medford issues a grim warning that "the atomic genie has been let out of the bottle", and further horrors may await mankind.
Split into simpler sentences: The nest's queen and egg chamber are then destroyed with flamethrowers. The senior Dr. Medford issues a grim warning that "the atomic genie has been let out of the bottle," and further horrors may await mankind.