Complex sentence: Boll was an active member of the "Neubrandenburger Reformbewegung", which was part of the reform movement of 1848, and as his career progressed, became good friends with novelist Fritz Reuter (1810--1874).
Split into simpler sentences: Boll was an active member of the "Neubrandenburger Reformbewegung", which was part of the reform movement of 1848. As his career progressed, he became good friends with novelist Fritz Reuter (1810--1874).