Complex sentence: His greatest contribution has been to present before all a true way of living as a Sikh, by being a good human being, being compassionate to all creatures, singing praise of God, service by selfless devotion.
Split into simpler sentences: His greatest contribution has been to present before all a true way of living as a Sikh. By being a good human being, being compassionate to all creatures, singing praise of God, service by selfless devotion.