two sitelinks on same keyword

ok i do not have any screenshot as iam using a cell phone.

but when i search"nike sneakers" on google, i saw two sites have sitelinks, #3 and #4, whats wrong?

 

nothing is wrong. they are called 'one line' sitelimks andcan appear for several sites in the SERPS
see http://googlewebmastercentral.blogspot.com/2009/04/one-line-sitelinks.html

 

In order to have sitelinks, what impoartant step should i do?
Does my site need to be large, complex websites?

 

Hi

Nothing wrong in that...........I think you two pages of a site in the ranking....home page and one internal page. In search engine rank the page not sites.

Regards
Jit