Complex sentence: Residents began to move out of the centre into the suburban areas which were included in Odense Municipality after boundaries were redefined in 1970, so the population declined slightly in the 1970s and 1980s, falling to 136,646 in 1981.
Split into simpler sentences: Residents began to move out of the centre into the suburban areas which were included in Odense Municipality after boundaries were redefined in 1970. As a result, the population declined slightly in the 1970s and 1980s, falling to 136,646 in 1981.