Complex sentence: Although the original location of the statue has been a matter of dispute, it is now appears that the statue was probably originally in the stupa: there is, however, a possibility that it might not have been established there as a religiously significant item.
Split into simpler sentences: Although the original location of the statue has been a matter of dispute, it is now appears that the statue probably was originally in the stupa. But there is a possibility that it might not have been established there as a religiously significant item.