Complex sentence: After the removal of the Choctaw tribe, President Jackson continued to put policies in motion that would continue to remove Indigenous people East of the Mississippi River; this created the removal process known as the Trail of Tears, and the removal of five different tribal nations.
Split into simpler sentences: After the removal of the Choctaw tribe, Jackson continued to put policies in motion that would continue to remove Natives east of the Mississippi River. That created the removal process known as the Trail of Tears and the removal of five different tribal nations.