Complex sentence: Arcelay began her career as an educator as a high school English language teacher at Theodore Roosevelt High School and later taught at the Jose de Diego High School, both located in the City of Mayagüez.
Split into simpler sentences: Arcelay began her career as an educator when she was hired as an English language teacher at Theodore Roosevelt High School. Later she taught at the Jose de Diego High School, both schools located in the City of Mayagüez.