Usage patterns
〈時〉の後半the latter half of 〈time period〉
Technology advanced greatly in the latter half of the 20th century.
後半に入るto enter the second half (of a game, period, etc.)
The match will soon enter its second half.
後半で〈動詞〉to do 〈verb〉 during the second half
They came back from behind in the second half.