I already know how to split a field which contains either Title and Artist but I'm now searching a way to do the same if Title and Artist are separated by spaces of variable length as in the attached screenshot.
Import the data with a mask that has at least 2 adjacent space characters between the data for TITLE and ARTIST, e.g %title%..%artist%
where each dot represents a space character.
Then process the fields that got the superfluous space characters with
Convert>Tag-Tag e.g for ARTIST
Format string: $trim(%artist%)
to remove the leading and trailing spaces.