Complex sentence: Mordechai Gebirtig (1877, Kraków-1942, Kraków) was a Yiddish poet and songwriter, regarded as one of the most influential and popular writers of Yiddish songs and poems.
Split into simpler sentences: Mordechai Gebirtig (1877, Kraków-1942, Kraków) was a Yiddish poet and musician. Hewas one of the most influential and popular writers of Yiddish songs and poems.