If you want to split up a movie into two parts this is the feature to do so. Just enter the Movie Editor, add a movie and select the Split Video button (s. picture below).
Now you’re just one click away to define the splitting point. Just click on the point to split and it will be marked with a green line and a splitting symbol (s. picture below). If there are problems to pick up this moment, please take a look at Navigate through a movie. click on Split Movie to proceed.