Complex sentence: Governor Moore's immediate concern had been building a ring of fortifications to protect the new settlement from attack by the Spanish, and planting of crops had been neglected, with settlers relying largely on fishing, hunting and foraging.
Split into simpler sentences: Governor Moore's immediate concern had been building a ring of fortifications to protect the new settlement from attack by the Spanish. Planting of crops had been neglected, with settlers relying largely on fishing, hunting and foraging.