Posted: Today at 15:00
keep the two biggest trunks and remove the rest, keep pulling the suckers - don't cut them with secateurs as they'll grow back more.
if you have big step ladders get into the crown (top of the tree) remove any dead, dying or generally manky looking branches. get down, go get a cup of tea and then go back up and remove any crossing or overly long lanky branches - make sure you cut near a joint otherwise you end up with dead stubs of wood.
it should re-sprout well this year and you'll still have some flowers next year and loads the year after. just don't take more than about a third of the top out in one go (hence the cup of tea break)