Complex sentence: Maurice Kufferath (1852--1919) was editor from 1887 till 1891; in 1889 the editorial office relocated to Paris and began publishing from both Paris and Brussels.
Split into simpler sentences: Maurice Kufferath (1852--1919) was editor from 1887 to 1891. In 1889, the editorial office relocated to Paris and began publishing from both Paris and Brussels.