Complex sentence: It is one of the oldest and largest international women's rights lobby groups, and was the 4th and for a long time one of very few NGOs with general consultative status with the United Nations system, the highest status possible for a non-governmental organization.
Split into simpler sentences: It is one of the oldest and largest international women's rights lobby groups. It was the 4th and for a long time one of very few NGOs with general consultative status with the United Nations system, the highest status possible for a non-governmental organization.