Complex sentence: Henan oil field is a state-owned oil field base with a combination of oil and gas exploration and development, fine chemicals manufacturing, construction operation, machanical engineering, multi-industry production and social services.
Split into simpler sentences: Henan oil field is a state-owned oil field base. Its business is a combination of oil and gas exploration and development, fine chemicals manufacturing, construction operation, machanical engineering, multi-industry production and social services.