Complex sentence: On 1 June 1867, she married Major Alexander Ewing (1830--1895) of the army pay department, also a keen churchgoer, who shared his wife's interest in literature.
Split into simpler sentences: On 1 June 1867, she married Major Alexander Ewing (1830--1895) of the army pay department. He was also a keen churchgoer, who shared his wife's interest in literature.