Is this a Day Return?
This isn't really my area but I'll have a go.
I am assuming a day return.
Flint - Gobowen SDR £8.60
Gobowen -Cwmbran SVR £34.00
Cwmbran-Cardiff SDR £6.50
Total = £49.10
A saving of £8.20 compared to the through fare of £57.30 Off Peak Return (SVR) which is valid on any permitted route and is valid for returning any day within 1 month.
The through fare is more flexible.
Bizarrely, Flint -Gobowen is cheaper than Flint - Chirk!