Complex sentence: Friedrich was a prolific artist and produced over 500 attritubted works during his life time, hoewever, he is generally known for a only a small number of works seen as emblems of Romantism.
Split into simpler sentences: Friedrich was a prolific artist and produced over 500 attritubted works during his life time. Hoewever, he is generally known for a only a small number of works seen as emblems of Romantism.