Complex sentence: There is a common misconception that the 15th Airborne Corps originally belonged to an infantry army in Deng Xiaoping's Second Field Army, owing to the fact that the 15th Army was transferred to the Second Field Army in 1950.
Split into simpler sentences: There is a common misconception that the 15th Airborne Corps initially origiated from Deng Xiaoping's Second Field Army. In fact, the 15th Army was transferred to the Second Field Army in 1950.