At the core, this formula replaces all forward slashes (/) with 100 spaces, then extracts 100 characters from the RIGHT and cleans this up with the TRIM function.
The replacement is done with SUBSTITUTE and REPT here:
Then, the RIGHT function extracts the last 100 characters of the string returned by SUBSTITUTE.
Finally, TRIM removes all leading and trailing space characters and returns the result.
Note: the use of 100 in this formula is arbitrary, and represents the maximum number of characters to be found after the final forward slash (/) in the original text. Adjust to suit your use case.