Complex sentence: The choir was, for practical purposes, established by a letter from Emperor Maximilian I of Habsburg on 7 July 1498, instructing court officials to employ a singing master, two basses and six boys.
Split into simpler sentences: The choir was, for practical purposes, established by a letter written by Maximilian I of Habsburg on 7 July 1498. In the letter the Emperor instructed court officials to employ a singing master, two basses and six boys.