Complex sentence: Galvis participated in the Florida Instructional League in 2006 before he began his professional career in 2007 with the Williamsport Crosscutters at age 17, as one of just five players not born in the United States.
Split into simpler sentences: Galvis participated in the Florida Instructional League in 2006. The next season, he officially began affiliated baseball in 2007 with the Williamsport Crosscutters at age 17, as one of just five players not born in the United States.