Complex sentence: While they possess the same overall shape and energy-draining properties of Metroids, Mochtroids are considerably weaker than Metroids and have only one internal nucleus (as opposed to the usual three or four).
Split into simpler sentences: While they possess the same overall shape and energy-draining properties of Metroids, Mochtroids are considerably weaker than Metroids. They have only one internal nucleus (as opposed to the usual three or four).