Steven, you don't say what the plant is but it looks like a dwarf variety of Spirea.  You can prune it, but you will lose the flowers from the parts you cut off.  At this time of year, and with our very hot conditions, blooming will slow down anyway.  Often, pruning will not only rejuvenate the plant but also encourage reblooming.  So, I would definitely do some light pruning to shape the plant and open it up for better air circulation.

Here is some more information on the care of Spirea from Clemson University extension:
https://hgic.clemson.edu/factsheet/spirea/
Hope this helps.

Thanks for your quick reply

Steven Gilman