Complex sentence: Anthony van Hoboken (1887-1983) was a Dutch musicologue whose "J. Haydn, Thematisch-bibliographisches Werkverzeichnis" (published 1957) is considered the most complete catalogue of the compositions of Joseph Haydn.
Split into simpler sentences: Anthony van Hoboken (1887-1983) was a Dutch musicologist. Hoboken is best known for his "J. Haydn, Thematisch-bibliographisches Werkverzeichnis" (published 1957) a catalogue of the compositions of Joseph Haydn.