Complex sentence: People of the island use Pranayama to weaken their Rajoguna and Tamoguna, and worship Hari (Vishnu) in Vayu (form) through meditation.
Split into simpler sentences: People of the island use Pranayama to weaken their Rajoguna and Tamoguna. These people are said to worship Hari (Vishnu) in Vayu (form) through meditation.