Complex sentence: Stewart Butterfield (born 1973) is co-founder of the photo sharing website Flickr and was president of Flickr's parent company Ludicorp prior to its acquisition by Yahoo! in March 2005.
Split into simpler sentences: Stewart Butterfield (born 1973) is co-founder of the photo sharing website Flickr. He was president of Flickr's parent company Ludicorp prior to its acquisition by Yahoo! in March 2005.