It is very easy and simple to migrate a website from WordPress to Blogger in few steps which are explained following
1. First Export a WordPress xml file and save it on your computer
2. Now convert wordpress xml file into blogger xml file by usiny a conversion utility that is called wordpress to blogger conversion utility.its link is here
https://wordpress2blogger.appspot.com/
3. If the wordpress file is big you can split it in small files using a software
4. Now when the file is ready than go to blogger and create a new blog or import the file in existing blog as you wish.
5. After importing all posts, now use a wordpress redirection plugin in wordpress domain domain admin and redirect all posts to related blogger posts.
6. Now you have done.