Complex sentence: The Kunbis, who are known to have a more tolerant attitude and are more secular than the Telis, prefer the Congress party which has caused the party to hold a dominant position in the region for several decades.
Split into simpler sentences: The Kunbis, who are known to have a more tolerant attitude and are more secular than the Telis, prefer the Congress Party. As a result, the Party has held a dominant position in the region for several decades.