Hi Stew,
I will assume you're already looking at your images in the Library module's Grid view. If not, do so. At the bottom of the grid, is the Toolbar. You can toggle this off/on using the 'T' key, so do that if you're not sure which element I am referring to. In the toolbar, locate "Sort:" and set it to "Capture Time". That will arrange your images in chronological order.
Some further thoughts, and some exercises to get your oriented:
If you wanted to keep the images separated according to which camera you shot them with, you could go ahead and keep them in two separate folders. To have them together for editing purposes, however, you could create a Collection, drag the contents of each folder into that collection, and then sort them by capture time.
Now, say you have the images all together, and you want to isolate those shot with a specific camera. Go to the top of the grid to locate the Filter bar. You can toggle this on/off using the "" key, so go ahead and try it if you don't know which element I'm getting at. In the Filter bar, you can filter by various means to isolate groups of photos based upon certain parameters. Click 'Metadata' and the filter will extend with new options. Under the camera column, select the Camera who's images you would like to filter. They will be isolated in the grid. You can turn the filter on/off by clicking on the word 'Metadata'.
I hope that helps some.
Cheers,
Matt