tl:dr merge 2 or more blogger export xml file into one.

I am moving from wordpress to blogger. I exported my wordpress blog to xml file and tried to convert it to blogger format. I found that wordpress2blogger.appspot.com does the job. Only restriction is the file should not be bigger than 1 mb. My wordpress file is huge. So i split the file into several small file using WXRsplit software. Now i converted all the wordpress split export file to blogger format.
I have nearly 100 xml file which is compatible to blogger. But the problem is i have to upload the files one by one manually. I should also do this work every week. It would highly time consuming. And also google have limits per day to upload.
If there is any option to combine all the blogger format xml file into one, it would solve my problem.
Do you have any idea on how to achieve it?