Complex sentence: Fischart wrote under pseudonyms; Such as Mentzer, Menzer, Reznem, Huidrich Elloposkleros, Jesuwalt Pickhart, Winhold Alkofribas Wustblutus, Ulrich Mansehr von Treubach, and Im Fischen Gilts Mischen there is doubt whether some of the works attributed to him are really his.
Split into simpler sentences: Fischart wrote under pseudonyms; such as Mentzer, Menzer, Reznem, Huidrich Elloposkleros, Jesuwalt Pickhart, Winhold Alkofribas Wustblutus, Ulrich Mansehr von Treubach, and Im Fischen Gilts Mischen. There is doubt whether some of the works attributed to him are really his.