Using Plex Web or Desktop, on the movie page, select the three dots to the right of the pencil icon. You should then see Split Apart as one of the choices.
TMDB has an entry for the 2007 film (link). You can use that ID on the folder/file name, and Plex should separate it from the 2008 film.
Note: You may need to Plex Dance the 2007 film after renaming/reorganizing.
The TMDB entry is sparse, so you won’t get much metadata. You can either add the missing info in Plex or create a TMDB account and add it there. Plex should pick up new info on TMDB in ~48 hours.
On my server, using a test file for both movies:
TMDB has no cover art for the 2007 movie, so Plex pulls an image from the test file (IMDB has no entry for the 2007 movie).
M:\PLEX TEST LIBRARIES\TEST-MOVIES
+---Wimbledon 2007 Official Film (2007) {tmdb-1262218}
| Wimbledon 2007 Official Film (2007) {tmdb-1262218}.mkv
|
\---Wimbledon 2008 Official Film (2008) {tmdb-601307}
Wimbledon 2008 Official Film (2008) {tmdb-601307}.mkv