Complex sentence: Following his retirement, Galvin continued to work in support of parks and conservation, and has on occasion still been asked to testify in Congress, and has frequently been sought out by the media to comment on Park Service matters.
Split into simpler sentences: Following his retirement, Galvin has continued to work in support of parks and conservation, and has on occasion still been asked to testify in Congress. He has also frequently been sought out by the media to comment on Park Service matters.