Complex sentence: Tolmides led an army out to challenge the Bœotians, but, after some early successes, was defeated at the Battle of Coronea; in the wake of this defeat, Pericles adopted a more moderate stance and Athens abandoned Boeotia, Phocis, and Locris.
Split into simpler sentences: Tolmides led an army out to challenge the Boeotians, but, after some early successes, was defeated at the Battle of Coronea. In the wake of this defeat, Pericles adopted a more moderate stance and Athens abandoned Boeotia, Phocis, and Locris.