Complex sentence: Midway Atoll, sometimes referred to as Midway Island, is the largest of the Northwestern Hawaiian Islands at 2.4 mi² (6.2 km²) and for quite some time had a permanent population of naval personnel.
Split into simpler sentences: Midway Atoll, sometimes referred to as Midway Island, is a 2.4 mi² (6.2 km²) archipelago. For quite some time, it had a permanent population of naval personnel.