AppleScript FAQ: How do I break a long line in AppleScript?
When you program in AppleScript, you can very easily start creating programs with very long lines, which are hard to read. And AppleScript doesn't like it when you use carriage returns to break your long lines, which is a bit of a bummer.
But, fear not, if you need to break a long line in AppleScript, you just need to know the magic keystroke character: Just type the [Option][Enter] or [Option][L] characters when you want to break a long line.