[General] Is there something wrong with this sentence?

[michael147]

Children were observed as they slowly grasped-- or, as the case might be encountered -- concepts that adults take for granted, as they refused, for instance, to concede that quantity is unchanged as water pours from a short stout glass into a tall thin one.

 

[SoothingDave]

It's a run on. Put a period after "granted." Also, you need a comma after "be."

 

[michael147]

It's a run on. Put a period after "granted." Also, you need a comma after "be."

Thank you. It makes more sense now. It's from my textbook.