Complex sentence: It was announced on August 28,2017, that Hillary Clinton would be starting a North American book tour in September 2017 to promote "What Happens", as well as the picture book "It Takes a Village".
Split into simpler sentences: It was announced on August 28,2017, that Hillary Clinton would be starting a North American book tour in September 2017. To promote "What Happens", as well as the picture book "It Takes a Village".