Complex sentence: The JMSDF chose SH-60B Seahawk as the successor of the Mitsubishi HSS-2A/B Sea King, first acquiring a S-70B-2 from Sikorsky for study in 1985.
Split into simpler sentences: The JMSDF chose SH-60B Seahawk as the successor of the Mitsubishi HSS-2A/B Sea King. The Japan Defense Agency acquired a S-70B-2 from Sikorsky for study in 1985.