Breakdown:
* Yo: I
* lo: him/her (masculine singular pronoun)
* extraño: miss
* mucho: much
* más: more
* de: than
* piensa: you think
Note:
* The "lo" can refer to a male person or a male object. If referring to a female person or object, it would be "la."
* The "piensa" is informal and can be replaced by "usted piensa" for a more formal tone.
Example:
If someone is talking about their ex-boyfriend, they could say "Yo lo extraño mucho más de piensa" to express their feelings of missing him more than others might think.