If it were me, I'd take a few (10-15) cuttings, grow them on and start by underplanting on one side in the angle, and then start to prune the other side back.
It will take time, unless you feel like ripping up the centre and replanting in a straight line.
When you trim it make sure you use a line and several posts, pulled taut. It looks as though it has been trimmed to a line which was only fixed at the two ends.
It will then grow to fill the middle bit where it has been over-trimmed.
Posts
It looks a bit big to dig up?
If it were me, I'd take a few (10-15) cuttings, grow them on and start by underplanting on one side in the angle, and then start to prune the other side back.
It will take time, unless you feel like ripping up the centre and replanting in a straight line.
When you trim it make sure you use a line and several posts, pulled taut. It looks as though it has been trimmed to a line which was only fixed at the two ends.
It will then grow to fill the middle bit where it has been over-trimmed.