Complex sentence: In the meantime, the Austrian commander Windisch-Grätz crushed the revolution from Prague, then came with the imperial army to Vienna to crush the revolution there, bringing the overwhelming superiority of the imperial army (80,000 Austrian soldiers against 27,000 Hungarians).
Split into simpler sentences: In the meantime, the Austrian commander Windisch-Grätz crushed the revolution from Prague, than came with the imperial army to Vienna to crush the revolution there. So the overwhelming superiority of the imperial army (80,000 Austrian soldiers against 27,000 Hungarians).