Complex sentence: At the Diet of Worms in 1521 a commitment was made to the strength of 20,063 infantrymen and 4,202 cavalry, later simplified to 4,000 and 20,000.
Split into simpler sentences: At the Diet of Worms in 1521 a commitment was made to keep the strength at 20,063 infantry and 4,202 cavalry. This was later simplified to 4,000 and 20,000.