Complex sentence: Their children were a daughter, Judith, and a son, Admiral Sir Eric Fullerton (1878--1962), who in 1908 married Dorothy Sibyl Fisher, one of the daughters of Admiral John Fisher, 1st Baron Fisher.
Split into simpler sentences: Their children were a daughter, Judith, and a son, Admiral Sir Eric Fullerton (1878--1962). In 1908 he married Dorothy Sibyl Fisher, one of the daughters of Admiral John Fisher, 1st Baron Fisher.