aarkay
What is the difference in meaning of these two sentences?
A. By 1973 the NOIC terminates the Western Oil Consortium's management and operational activities, leading to the pressure on the NOIC to raise its oil output.
B. By 1973 the NOIC terminates the Western Oil Consortium's management and operational activities, which lead to the pressure on the NOIC to raise its oil output.
A: Leading to the pressure --- This present participle phrase(ING modifier) shows the result of the action "terminates". Because NOIC terminated X, Y happened. The ING modifier is modifying the clause and showing the result.
BTW, the tense used here is WRONG. We need a past perfect tense here - had terminated.
B: The issue with this one is the use of "which". 'which' here refers to the closes noun - activities. And per the meaning, activities didn't lead to increase in oil output. Unlike "ING modifier", 'which' is a relative pronoun and cannot refer to the entire clause. Therefore, the usage is wrong here. BTW, same verb tense issue in this sentence too.
Hope this helps!