How can I separate tasks and keep them together in subprojects?

As you can see, it is messy and jumbled. How can I put #1 under #10 short of changing dates, which I cannot as the dates are firm. The due dates for these are the same for #10 and #1, but belongs to the new set of tasks.  This is for a newsletter that goes out every month. If anyone can give me tips on how to get these in line, I'd appreciate it. Thanks!