So, my plan is to move all content from Site A to Site B while keeping the authors name. Site B is an established site. Also, i want the redirection been made from Site A to Site for each of the content so it will not hurt the SEO. Maybe this can be done with a plugin. Please help me, thanks!
There are redirect plugins. Search the Wordpress directory and you will find something that will help you. here is a few http://wordpress.org/extend/plugins/search.php?q=redirect&sort=