Complex sentence: First as the biggest producer of coffee, the main product that dominated the state agriculture, specially in the higly cultivated northern part of the state, that remains until a big natural disaster, the big frost of 1975, that destroy most of the coffee trees.
Split into simpler sentences: First as the biggest producer of coffee, the main product that dominated the state agriculture, specially in the higly cultivated northern part of the state. That situation remained until a big natural disaster, the big frost of 1975, that destroy most of the coffee trees.