Complex sentence: Thus, Thumbay Group's first venture Gulf Medical University was established, which ultimately became a destination for medical education, not only for local students, but to students from over 70 countries and staff from 22 countries.
Split into simpler sentences: Thus, Thumbay Group's first venture Gulf Medical University was established. This ultimately became a destination for medical education--not only for local students, but to students from over 70 countries and a staff from 22 countries.