Complex sentence: His work has influenced policy at the highest levels of government, and produced strong and lasting collaborations between the governments of Mexico and the United States, as well as between academic institutions and non-governmental organizations across both countries.
Split into simpler sentences: His work has influenced policy at the highest levels of government. It has also created strong and lasting collaborations between the governments of Mexico and the United States, as well as between academic institutions and non-governmental organizations from both countries.