Complex sentence: The Wachtendonck Psalms are a collection of Latin psalms, with a translation in an eastern variety of Old Dutch (Old Low Franconian) which contains a number of Old High German elements; it was probably based on a Middle Franconian original.
Split into simpler sentences: The Wachtendonck Psalms are a collection of Latin psalms, with a translation in an eastern variety of Old Dutch (Old Low Franconian). It contains a number of Old High German elements, because it was probably based on a Middle Franconian original.