Complex sentence: Felicjan Kowarski (1890--1948) was a Polish painter and sculptor, known mostly from his monumental wall paintings and plaphonds (eg. plafond in the "Hall under the Birds" at castle of Wawel).
Split into simpler sentences: Felicjan Kowarski (1890-1948) was a Polish painter and sculptor. Known mostly from his monumental wall paintings and plaphonds (ex. plafond in the "Hall under the Birds" at castle of Wawel).