Complex sentence: For example, a person holding the MM-3385 is a nuclear-trained machinist's mate for surface ships, and a person with an MM-3355 is a nuclear-trained machinist's mate for submarines.
Split into simpler sentences: For example, a person holding the MM-3385 is a nuclear-trained machinist's mate for surface ships. While a person with an MM-3355 is a nuclear-trained machinist's mate for submarines.