Simplify the following text for a Grade 5 native English-speaking person.
Original: Unlike a honey bee 's stinger a bumblebee 's stinger lacks barbs , so they can sting more than once . Bumblebee species are not normally aggressive , but will sting in defense of their nest , or if harmed .
Simplified: However , the bumblebee sting does not damage it when used , and they can sting several times .