Complex sentence: These geological structures, formed from masses of basalt (typical of mid-ocean regions), are of a geomorphological interest (due to their rich deposits of ore), and addition to being a rich ecosystem of diverse subaquatic plant and animal life.
Split into simpler sentences: These geological structures, formed from masses of basalt (typical of mid-ocean regions), are of a geomorphological interest due to their rich deposits of ore. In addition it fosters a rich ecosystem of diverse subaquatic plant and animal life.