Converting PDF to Powerpoint, importing each slide as a singular picture
You could use web services such as Zamzar to convert your PDF to PPT directly, but the downside is lack of privacy and watermark on your PPT. 

It is better to split the process into two steps:


Export PDF into images
Import images into PPT


Export PDF into JPG using Preview

macOS' Preview has built in functionality to export your PDF into PNGs. Once you have your PDF open in Preview, 


Choose View > Thumbnails or press ⌘ + ⌥ + 1
Select all the pages you want to export, click on File > Export
Select JPG format and the appropriate quality


Use ImageMagick

If you have ImageMagick installed, use a similar command as

magick -density 200 -trim input.pdf -quality 100 -flatten output-%02d.jpg


assuming the PDF is created with 200 dpi. You can adjust the density and scaling accordingly to create the best quality image. See this StackOverflow answer. 

Note: Imagemagick uses Ghostscript in the background. You can use Ghostscript directly but the syntax is not as user-friendly. For example:

gs -dNOPAUSE -sDEVICE=jpeg -r200 -dJPEGQ=100 -sOutputFile=output-%02d.jpg input.pdf -dBATCH


Import Images into Powerpoint

Open up a new Presentation in Powerpoint and click Insert > Photo Album



Select all the images and click Create



And now you the PDF content is imported into Powerpoint