Make blog description 2 lines

Hi, I’m a noob at all of this so my apologies in advance.

I’m running a Twenty Eleven Child’s theme for my blog and the verbiage I want to use for my blog description, under the title, is long. It needs to be on 2 lines. How can I do this? Because I’m so new at this, any explanation would be best explained as if I were a 2 year old. ??

This is my blog for reference.

Thanks in advance!