Complex sentence: It saw a turnout of 21,000 supporters of the LGBT community, the strongest-yet turnout, with 6,000 more participants compared to last year's crowd of 15,000, rendering it the largest ever civil-society gathering in the country.
Split into simpler sentences: It saw a turnout of 21,000 supporters of the LGBT community, the strongest-yet turnout, with 6,000 more participants compared to last year's crowd of 15,000. The event was the largest ever civil-society gathering in the country.