Posted: 29/08/2016 at 08:57
that's a Forsythia
I think they're best pruned by cutting some old stems right to the ground. Usually recommended to be done after flowering but I'd do some of those this winter, it will look better at flowering time. Then next year you can take a few more out. It will grow new stems and in a year or to will be a new bush.
Shortening all the stems to the required height gives you the shapeless blob you have there.