Complex sentence: In 492 BC, the Persian general Mardonius led a campaign through Thrace and Macedonia and, while victorious and having re-subjugated the former and conquered the latter, Joseph Roisman, Ian Worthington.
Split into simpler sentences: In 492 BC, the Persian general Mardonius led a campaign through Thrace and Macedonia. He was victorious and again subjugated the former and conquered the latter, Joseph Roisman, Ian Worthington.