Complex sentence: Turning to the first case, resolving line 12 with the axiom in line 1 leads to instanciation of the program variable M in line 14; intuitively, the last conjunct of line 12 prescribes the value that M must take in this case.
Split into simpler sentences: Turning to the first case, resolving line 12 with the axiom in line 1 leads to instanciation of the program variable M in line 14. Intuitively, the last conjunct of line 12 prescribes the value that M must take in this case.