Complex sentence: A cricketer scoring a century (100 runs or more) on his Test match debut is considered a significant achievement, and as of October 2015, it has been accomplished 101 times by 99 players.
Split into simpler sentences: A cricketer scoring a century (100 runs or more) on his Test match debut is considered a significant achievement. As of October 2015, it has been accomplished 101 times by 99 players.