Scientific studies into human vaccines have shown that just as many vaccinated people, and sometimes more vaccinated people, contract diseases as do unvaccinated people.
(Scientific studies into human vaccines; have shown; that) (just as many vaccinated people, and sometimes more vaccinated people, contract diseases; do; unvaccinated people)
Scientific studies into human vaccines just as many vaccinated people, and sometimes more vaccinated people, contract diseases
have shown do
that
unvaccinated people