'올망졸망' is an adverb which indicates small or cute things in a cluster. Ex) A lot of small apples were hanging from on the tree. You can translate this sentence directly to "수많은 작은 사과들이 나무에 달려 있었습니다.". If you want to decorate this sentence, then you can say also: 1) "수많은 작은 사과들이 올망졸망 나무에 달려 있었습니다." 2) "수많은 작은 사과들이 나무에 올망졸망 달려 있었습니다."