Complex sentence: Designed by Shanghai Jiao Tong University, the first ship entered service in December 1977, and a total of three were completed, and all of them remain active as early 2010s, despite their replacements have already entered service.
Split into simpler sentences: Designed by Shanghai Jiao Tong University, the first ship entered service in December 1977. A total of three were completed, and all of them remain active as of the early 2010s, despite the fact that their replacements have already entered service.