This is a very strange sentence in English -what is the true sense of the Welsh? I guessed it might be 'he has been living in the west until now' on the basis that Welsh (like French and many other languages) uses the present tense rather than the past if the action is continuous. The classic example would be 'I have been living here since...' where I believe Welsh would use the present rather than a form of the past ('Dw i'n byw yn Bryste ers 2009'). Or am I on the wrong track here?
The implied meaning is that of someone who has finally moved to the West after previously living somewhere else.