Complex sentence: He is considered by many to be the "grandfather of Yiddish literature," a name applied by Aleichem in the dedication to his novel "Stempenyu"; his style in both Hebrew and Yiddish has strongly influenced several generations of later writers.
Split into simpler sentences: He is considered by many to be the "grandfather of Yiddish literature", an epithet first accorded to him by Sholem Aleichem, in the dedication to his novel "Stempenyu". Mendele's style in both Hebrew and Yiddish has strongly influenced several generations of later writers.