I converted a partition of my HDD to a simple volume, and on my other partition was an ext4 which I then changed back to NTFS. Now, the NTFS has been picked up by Windows 10 as the "main" drive, and now doesn't recognize the simple volume and as a result, my files are stuck on the simple volume(which I cannot see).

How would I go about recovering the data?

Here is a screenshot of the current situation (if it does help).Click image for larger version. 

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