Complex sentence: The Glagolitic alphabet (also known as "Glagolitsa") is the oldest known Slavic alphabet that was created in the 9th century by Saint Cyril, a Byzantine monk from Thessaloniki.
Split into simpler sentences: The Glagolitic alphabet (also known as "Glagolitsa") is the oldest known Slavic alphabet. It was created in the 9th century by Saint Cyril, a Byzantine monk from Thessaloniki.