Complex sentence: On 20 May 2013, Yahoo unveiled a major reconstruction of the website, changing its look and layout, giving all users of free accounts 1 TB of storage, and discontinuing the "Flickr Pro" account option for new users.
Split into simpler sentences: On 20 May 2013, Yahoo unveiled a major reconstruction of the website, changing its look and layout. The change gives all users of free accounts 1 TB of storage, and discontinuing the "Flickr Pro" account option for new users.