Aomei Dynamic Disk Manager could also help you convert dynamic disk to basic disk without losing any data.
Step1. Launch Aomei Dynamic Disk Manager, right-click the dynamic disk you want to convert, select "Convert to Basic Disk".
Step2. In the pop-up window, click "OK".
Step3. Click "Commit" on the toolbar to finish the operation.
Note:
You could only convert the dynamic disk which contains the simple or mirrored volume, other types of volumes cannot be handled. For more info, please read FAQ.