Complex sentence: Throughout Christendom, some adherents mark the season with the traditional abstention from the consumption of meat, most notably among Roman Catholics; this practice is observed in numerous pious Catholic countries, although the form of abstention may vary depending on what is customary.
Split into simpler sentences: Throughout Christendom, some adherents mark the season with the traditional abstention from the consumption of meat, most notably among Roman Catholics. This practice is observed in numerous pious Catholic countries, although the form of abstention may vary depending on what is customary.