Complex sentence: During this time, the first Christian fraternities were established by religious students missing belief as a basic principle of unity, and although some of them still took up weapons, many refused to do so from an ethical and religious standpoint.
Split into simpler sentences: During this time, the first Christian fraternities were established by religious students missing belief as a basic principle of unity. Although some of them still took up weapons, many refused to do so from an ethical and religious standpoint.