Complex sentence: On 8 December 1974, the Greek plebiscite, 1974 had a similar outcome to that of the previous year: the majority were in favour of a republican constitution (69%) over restoration of the monarchy (31%).
Split into simpler sentences: On 8 December 1974, the Greek plebiscite, 1974. As in the one of the previous year, the outcome was in favour of a republican constitution (69%), over restoration of the monarchy (31%).