Complex sentence: In modern history it is notable as one of the four ports specified to be opened in the Treaty of Shimonoseki grew rapidly because of this, gaining the moniker of "Little Hankow".
Split into simpler sentences: In modern history it is notable as one of the four ports specified to be opened in the Treaty of Shimonoseki. It grew rapidly into because of this, gaining the moniker of "Little Hankow".