Punctuate your talk. An hour talk should have several major sections. These sections should be introduced at the start of the talk. It should be clear when you start a section and when you finish a section. An audience cannot concentrate for an entire hour.
Sections give mental resting places.
There should be a clear break AND a sensible transition between sections. Now let's talk about recovery after a crash happens. Each section should be structured like a mini-talk. Tell them what you told them. This isn't quite right.