Complex sentence: Sarah Mitroff and Lynn La of "CNET" wrote that the service's phone and tablet apps were particularly good, and that Google Photos had a more streamlined design than Yahoo's Flickr and more organizing features than Apple's iCloud photo service.
Split into simpler sentences: Sarah Mitroff and Lynn La of "CNET" said the service's phone and tablet apps were particularly good. They added that Google Photos had a more streamlined design than Yahoo's Flickr and more organizing features than Apple's iCloud photo service.