This is a pretty good start. There are better ways of doing this without having to resort to copy/pasting the same type of information to add new content. One way I'd recommend is to think about it logically and make things that repeat themselves put on a single line, such as msg $chan $nick. Since these lines all share this trait in common, making it so it only has to use it once will save a lot of space when it's used a bunch of times.

Another thing that you can do is to set the new sentences to a single variable and just return the variable. This will also save space. The best way is to use tokens or a file for something as simple as this. Files can sometimes be a pain in the butt, since you have to edit a separate thing, but in the long run, it's a lot more manageable and makes your code a lot cleaner. If you don't want to attach a file with your script, which many people opt not to do, you could use tokens. Check out the Token Identifiers file in the help.