 Even though it rained until the starting of marathon and half-marathon classes, but the race finally finished properlywith its weather progressively improved to be not rained.
<fluency>  Even though it rained until the starting of marathon and half-marathon classes, but the race finally finished properlywith its weather progressively improved to be not rained.
 Although it rained until the starting of marathon and half-marathon classes, but the race finally finished properlywith its weather progressively improved to be not rained.