Complex sentence: Remaining diploid eggs receive extra food and pupate to become new queens, though the queen can use pheromones to discourage to some extent the workers' inclination to invest more in larvae around this time, thereby ensuring that not too many become queens.
Split into simpler sentences: Remaining diploid eggs receive extra food and pupate to become new queens. The queen can use pheromones to discourage the workers' inclination to invest more in these larvae, thereby ensuring that not too many become queens.