It really depends on the expected arrangement of the string you are trying to parse.
Provided all the strings you will get will be of the form “[title] [season] [episode]”, where [title] may contain any number of spaces, but [season] and [episode] never will, then you can just drop the last two (which you know be the irrelevant season and the episode), and join the rest with spaces again:
let separator = " "
let components = episodeTile.components(separatedBy: separator)
let titleComponentsOnly = components.dropLast(2)
let title = titleComponentsOnly.joined(separator: separator)
You might want to ask if the API you got the string from can vend you the properly capitalized title directly though. The all caps looks kind of ugly and it cannot be reliably undone. In combination with the episode numbers it looks more like an internal identifier to me than something for presenting to users—which is what makes me suspect they may provide exactly what you are looking for elsewhere in the API.