Complex sentence: Henryk Struve (alias Florian Gąsiorowski) (1840-1912) was a Polish philosopher, "perhaps the most remarkable person in logic in Warsaw in the 19th century".
Split into simpler sentences: Henryk Struve (also known as Florian Gąsiorowski) (1840--1912) was a Polish philosopher. He has been called "perhaps the most remarkable person in logic in Warsaw in the 19th century".