Complex sentence: Because of this effect, the presence of massive stars in a star forming region is thought to have a great effect on planet formation from the disk around a YSO, though it is not yet clear if this effect decelerates or accelerates it.
Split into simpler sentences: Because of this effect, the presence of massive stars in a star forming region is thought to have a great effect on planet formation from the disk around a YSO. Though it is not yet clear if this effect decelerates or accelerates it.