Complex sentence: It serves as Iran's only oceanic port, and is comprised of two separate ports named "Shahid Kalantari" and "Shahid Beheshti", each of which have five berths.
Split into simpler sentences: It serves as Iran's only oceanic port. Chabahar port is actually comprised of two separate ports named "Shahid Kalantari" and "Shahid Beheshti", each of which have five berths.