Complex sentence: An additional responsibility came in 1783, when Ulster King of Arms became registrar for the newly established chivalric Order of St Patrick as an Irish equivalent of such long-established English institutions as the Order of the Garter.
Split into simpler sentences: An additional responsibility came in 1783, when Ulster King of Arms became registrar for the newly established chivalric Order of St Patrick. This was an Irish equivalent of such long-established English institutions as the Order of the Garter.