Complex sentence: He later ordered to stop all police actions against protesters and reopened the previously closed border to Czechoslovakia, but a few days later, on 23 October, more than 300,000 people joined the Monday demonstration in Leipzig and many more at other protests throughout the country.
Split into simpler sentences: He later ordered the cessation of all police actions against protesters and reopened the previously closed border to Czechoslovakia. A few days later, on 23 October, more than 300,000 people joined the Monday demonstration in Leipzig, and many more at other protests throughout the country.