Complex sentence: In the 2003/2004 competition season, Olivia competed one level 9 meet, advanced to level 10 qualifying to Level 10 Junior Olympics Championships (2004), and began her pursuit to become an elite gymnast.
Split into simpler sentences: In the 2003/2004 competition season, Olivia competed one level 9 meet, and advanced to level 10 qualifying to Level 10 Junior Olympics Championships (2004). In 2004 she began her pursuit to become an elite gymnast.