The source uses numerical alternatives: on one side, “the number is even or odd”, and on the other, whether it is divisible into equal parts or not.
Make the first entire disjunction the antecedent and the second entire disjunction the consequent of a new connection. The result is a connected conditional composed of two disjunctions.
“Even” and “odd” are alternatives within the inner antecedent. They are not themselves the two components of the outer conditional; each complete “or” statement forms one outer component.