Complex sentence: Inter-city train services crossing the Hong Kong-China boundary (often known as "through trains") are jointly operated by Hong Kong's MTR Corporation and the Ministry of Railways of the People's Republic of China.
Split into simpler sentences: Inter-city train services crossing the Hong Kong-China boundary are known as Intercity Through Trains. They are jointly operated by Hong Kong's MTR Corporation and the Ministry of Railways of the People's Republic of China.