How do you use a semicolon?
A semicolon is used in place of a period between two sentences to indicate that the sentences are closely related.
The dogs barked wildly. The chickens squawked and fluttered about the yard. Mary sat crying on the ground.
could be written as:
The dogs barked wildly; the chickens squawked and fluttered about the yard; Mary sat crying on the ground.
The second version gives a sense (or is intended to give a sense) of the connectedness of the activities.