Complex sentence: For the following 20 years, the U.S. government invested in infrastructure, health care, and education on the reservations, and over two million acres (8,000 km²) of land were returned to various tribes.
Split into simpler sentences: For the following 20 years, the U.S. government invested in infrastructure, health care, and education on the reservations. Likewise, over two million acres (8,000 km²) of land were returned to various tribes.