Complex sentence: Huldrych Zwingli, the first theologian in the Reformed tradition, also rejected the view of transubstantiation, but he disagreed with Luther by holding that Christ's body is not physically present in the Eucharist.
Split into simpler sentences: Huldrych Zwingli, the first theologian in the Reformed tradition, also rejected the view of transubstantiation. He also disagreed with Luther, by holding that Christ's body is not physically present in the Eucharist.