Complex sentence: Exceptions to that total number were granted to spouses, minors and parents of United States citizens, however, the total allotment of 120,000 in 1965 still was not enough to address the demand for visas from Mexico.
Split into simpler sentences: Exceptions to that total number were granted to spouses, minors and parents of United States citizens. However, the total allotment of 120,000 in 1965 still was not enough to address the demand for visas from Mexico.