This should just be a simple sentence
Well, it’s not even a sentence, you’ve got a random full stop in the middle of it. I hope the rest of your CV is proof-read more closely.
However I am now looking for fresh challenges in a new environment that will test the skills and experiences I have developed in my career to date
“However I am now looking for fresh challenges in a new environment which will test the skills and experiences that I have developed in my career to date.”
TBH I’d be inclined drop the entire thing, it’s just additional words and meaningless. You’re “looking for fresh challenges in a new environment” just like every single other candidate in existence. If you were looking to do the same thing in the same environment then you wouldn’t be job-hunting.