Complex sentence: The charter of the medical college was reactivated in 1969 when it became part of Rush-Presbyterian-St. Luke's Medical Center; in 1971, Rush Medical College reopened with a class of 66 first-year students and 33 third-year students.
Split into simpler sentences: The charter of the medical college was reactivated in 1969 when it became part of Rush-Presbyterian-St. Luke's Medical Center. In 1971, Rush Medical College reopened with a class of 66 first-year students and 33 third-year students.