Complex sentence: Throughout 2009, the site held semi-regular guest editorships-celebrating Labour's youth movement, International Women's Day, and marking May Day with the Unions, Pride with LGBT Labour, and the Co-operative Party conference in September.
Split into simpler sentences: Throughout 2009, the site held semi-regular guest editorships, celebrating Labour's youth movement and International Women's Day. The site also marked May Day with the Unions, Pride with LGBT Labour, and the Co-operative Party conference in September.