Complex sentence: Rosenberg is also a founder and Co-chair of the Massachusetts Legislatures Foster Kid Caucus, the first of its kind in the nation, the caucus seeks to improve the conditions and address issues related to foster and adopted children.
Split into simpler sentences: Rosenberg is also a founder and co-chair of the Massachusetts Legislature's Foster Kid Caucus, the first of its kind in the nation. The caucus seeks to improve the conditions and address issues related to foster and adopted children.