Complex sentence: Arevalo's conclusions were widely accepted until the early 20th century, but further studies led by Ernst von Dobschütz showed this decretal to be a forgery, probably from a scholar of the 6th century.
Split into simpler sentences: Arevalo's conclusions were widely accepted until the early 20th century. A study led by Ernst von Dobschütz concluded this decretal to be a forgery, probably from a scholar of the 6th century.