Answer:
Mustafa is an excellent long-distance runner, and he won the race last weekend.
Step-by-step explanation:
An active voice is when the subject of the sentence is directly performing the action after him, for example, sue does the laundry, the subject comes first and then you add the action performed, in the example you read Mustafa won the race last weekend, so its the subject first and then the action performed, if you would like to do it in a passive voice you have to make reference to the action first, like in the first option:and the race had been won by him last weekend.
That´s why the correct option is the second one:
Mustafa is an excellent long-distance runner, and he won the race last weekend.