Complex sentence: A photoblog (a.k.a. photolog or phlog) is a form of photo sharing and publishing in the format of a blog, but differentiated by the predominant use of and focus on photographs rather than text.
Split into simpler sentences: A photoblog (or photolog, or phlog) is a form of photo sharing and publishing in the format of a blog. It differs from a blog through the predominant use of and focus on photographs rather than text.