in your macro press 'if ...' -> configure -> press + to add new condition
select AND/OR/XOR/NOT (in Macrodroid specific category), then the operator you like
for each operator you can add a constraint (condition in other languages, but called constraint in macrodroid) or another operator (another AND/OR/XOR/NOT, and this way by nesting you achieve the same effect as enclosing in parentheses)
needs some practice initially but it's really easy in the end
for your example you add AND first
then under AND, add condition_1 and below it the OR operator
finally under OR you add condition_2 and condition_3