Complex sentence: By 2008 IDEA had 10 schools and was serving 4000 students and by 2010 IDEA had 14,000 students on a waiting list for its schools in the Rio Grande Valley.
Split into simpler sentences: By 2008 IDEA had 10 schools and was serving 4000 students. By 2010 IDEA had 14,000 students on a waiting list for its schools in the Rio Grande Valley.