Complex sentence: Then after the birth of Postgraduate Medical Institute Lahore in 1974, Lahore General Hospital Lahore was affiliated with Postgraduate Medical Institute in July, 1975, except the department of Neurosurgery, T.B & Chest; both these departments remained attached with K.E.M.C, Lahore.
Split into simpler sentences: Then after the birth of Postgraduate Medical Institute Lahore in 1974, Lahore General Hospital Lahore was affiliated with Postgraduate Medical Institute in July, 1975. Except the department of Neurosurgery, T.B & Chest; these both departments were remain attached with K.E.M.C, Lahore.