Complex sentence: NewsKnowledge is a commercial service supplies web sites and digital signage products with quality news content, and their headline products searches and retrieves news headlines from more than 22,000 carefully selected sources from around the world.
Split into simpler sentences: NewsKnowledge is a commercial service which supplies web sites and digital signage companies with quality news content. Their headline news products searches and retrieves news headlines from more than 22,000 carefully selected sources from around the world.