Complex sentence: The shield of Madeira, together with its seal and flag, was established in 1978, but its complete achievement of arms (with the addition of supporters, motto, helmet and crest) was only established in 1991.
Split into simpler sentences: The shield of Madeira-together with its seal and flag-was established in 1978. However, its complete achievement of arms (with the addition of supporters, motto, helmet and crest) was only established in 1991.