Complex sentence: The Benedictine abbey was founded by Dirk I, Count of Holland, apparently in about 920-925, as a nunnery that, according to local tradition, had been there since Saints Adalbert and Willibrord landed in 760.
Split into simpler sentences: The Benedictine abbey was founded by Dirk I, Count of Holland, in about 920-925. It was a nunnery that, according to local tradition, had been there since Saints Adalbert and Willibrord landed in 760.