Complex sentence: The Sea Pole (Hai Ji, or 海极) class bathyscaphe is a class of little known bathyscaphe of the People's Republic of China (PRC), capable of diving up to 7,000 metres, covering 99.8% of the oceanic floor of the world.
Split into simpler sentences: The Sea Pole (Hai Ji, or 海极) class bathyscaphe is a class of little known bathyscaphe of the People's Republic of China (PRC). They are capable of diving up to 7,000 metres, covering 99.8% of the oceanic floor of the world.