There is a question in OG similar to the below sentence -
Reteors, at 5 light years from the Earth, are believed to be the .....
Using one incorrect option the above sentence becomes -
Reteors, at 5 light years from the Earth, some believe them to be the .....
The OG explanation says -
The clause - some believe them to be - supplies an object "them" so that Reteors cannot be the object, making the sentence ungrammatical,
Can anyone of the experts rephrase this explanation in simple language