Problem with Pages text breaks

Hi guys. As a writer, I'm going to be using Pages on my brand new MacBook Pro 13" (I just switched from Windows) quite a lot, so it really ticks me off that whenever I insert text in a line in a paragraph, the line below it gets separated from the rest of the text instead of simply moving the text on the line I'm editing smoothly into the following lines. How do I fix this?

 

anybody? Here's a picture of the problem that I'm trying to avoid. Hopefully this helps.