Complex sentence: In orthography, the term umlaut is sometimes used as a shortening of "umlaut mark", a diacritic used in German spelling to represent the synchronic results of Germanic phonological Umlaut, and subsequently in other languages which borrowed the symbol.
Split into simpler sentences: In orthography, the term umlaut is sometimes used as a shortening of "umlaut mark", a diacritic. It is used in German spelling to represent the synchronic results of Germanic phonological Umlaut, and subsequently in other languages which borrowed the symbol.