Complex sentence: It is worth noting that due to the Peisistratid that Homeric reformation became compulsory, the Homeridae, like other rhapsodes, switched to a designated text, which they themselves had approved.
Split into simpler sentences: It is worth noting that due to the Peisistratid that Homeric reformation became compulsory. The Homeridae, like other rhapsodes, switched to a designated text which they themselves had approved.