If you need to clean it up for display or renaming, here are a few options:
A common proper text version of that file name would be: The.Diary.of.a.Teenage.Girl.2015.720p.BluRay.HI...
(or .mkv, depending on the actual file extension) If you need to clean it up for
The Diary of a Teenage Girl (2015) – 720p BluRay The.Diary.of.a.Teenage.Girl.2015.720p.BluRay.HI...
The.Diary.of.a.Teenage.Girl.2015.720p.BluRay.x264-HI
It looks like you’re trying to correct or properly format a filename for the movie .