Original sentence: "  The aggressive marketing practices of Johann Tetzel in promoting this cause provoked Martin Luther to nail his 95 theses to the church door at Wittenberg, protesting what he saw as the purchase and sale of salvation
Edited sentence: "  The aggressive marketing practices of Johann Tetzel in promoting this cause provoked Martin Luther to nail his 95 theses to the church door at Wittenberg, protesting what he (incorrectly) saw as the purchase and sale of salvation