Complex sentence: As vice presidential counsel, Addington is known for his focus on the constitutional independence of the Vice President, including in the context of federal lawsuits to prevent incursions into the inner workings of the Office of the Vice President by the Government Accountability Office and private organizations.
Split into simpler sentences: As vice presidential counsel, Addington is known for his focus on the constitutional independence of the Vice President. He tried to protect the inner workings of the Office of the Vice President from investigations by the Government Accountability Office (GAO) and private organizations.