Complex sentence: Through homeland military successes of the young Swedish king and the diplomatic activity of Louis XIV, a peace congress began its sessions at Nijmegen in March 1677; and in the beginning of April 1678, the French king dictated the terms of a peace.
Split into simpler sentences: Through homeland military successes of the young Swedish king and the diplomatic activity of Louis XIV, a peace congress began sessions at Nijmegen in March 1677. In the beginning of April 1678, the French king dictated the terms of a peace.