Complex sentence: Most successful candidates will have an advanced degree (often a masters) and pertinent job experience related to their backstop, and will undergo an interview and testing process tailored to that backstop, but otherwise similar to that for State Department applicants.
Split into simpler sentences: Most successful candidates will have an advanced degree (often a Masters) and pertinent job experience related to their backstop. Candidates undergo an interview and testing process tailored to their backstop, but otherwise similar to that for State Department applicants.