Complex sentence: SML Isuzu Limited was formed in 2010 from the Swaraj Mazda company after Mazda pulled out of the venture and the Swaraj name was sold to Mahindra when the tractor division, (Punjab Tractors), was sold off.
Split into simpler sentences: SML Isuzu Limited was formed in 2010 from the Swaraj Mazda company. Mazda had pulled out of the venture, and the Swaraj name had been sold to Mahindra when the tractor division, (Punjab Tractors), was sold off.