If it's a relatively clean break, the respective pieces can be drilled and fitted back together with a metal rod. If it's shattered into multiple pieces then it would take a little more extensive work.
Worst case, if larger pieces are missing, there's always the possibility that a section could be carved out from underneath the base and resculpted from photos to match the original.
the sad thing is that now we’ll increasingly have to lock up our gardens and parks and trails and boat launches etc so vandals won’t get after them...