Complex sentence: The updip area on the downthrown block is the main target of oil and gas exploration as it has synthetic and antithetic faults as well as rollover anticlines that are considered as structural traps preventing oil and gas from escaping.
Split into simpler sentences: The updip area on the downthrown block is the main target of oil and gas exploration because it has synthetic and antithetic faults and rollover anticlines. These are considered as structural traps preventing oil and gas from escaping.