I'll improve it on the server, and here are the commands I used if you need them:
Zombie Spawner :
/setblock ~0 ~1 ~0 mob_spawner 0 replace {SpawnCount:1,SpawnRange:4,maxNearbyEntities:6,Delay:20,MinSpawnDelay:5,MaxSpawnDelay:5,EntityId:Zombie}
Kill all Sheeps :
/kill @e[type=Sheep]
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