Complex sentence: Among the religious groups in the Soviet Union, a number of Protestant Free Churches gave rise to movements that opposed the anti-religious state directives, including the Baptists, the Seventh Day Adventists, and the Pentecostals.
Split into simpler sentences: Among the religious groups in the Soviet Union, a number of Protestant Free Churches gave rise to movements that opposed the anti-religious state directives. These movements included the Baptists, the Seventh Day Adventists, and the Pentecostals.