Complex sentence: A private birthday party for one of the trustess of The ABC Trust was held on the first weekend in September 2004 in the grounds of the house of a friend of the charity, in Yarnton, Oxfordshire.
Split into simpler sentences: A private birthday party for one of the trustess of The ABC Trust was held on the first weekend in September 2004. A friend of the charity hosted the event in the grounds of their house charity in Yarnton, Oxfordshire.