Complex sentence: She qualified in the heats with an Olympic record, 8:12:86, and set a world record in the finals of 8:04:79, over 11 seconds faster than the silver medalist, Jazmin Carlin.
Split into simpler sentences: She qualified in the heats with an Olympic record, 8:12:86, and set a world record in the finals of 8:04:79. That was over 11 seconds faster than the silver medalist, Jazmin Carlin.