Here's a breakdown of the errors and a possible correction:
* "Lla" should be "Ellos" (they, masculine plural)
* "estan" is the correct spelling of "are" in the present tense
* "vin" should be "muy" (very)
* "grandey" should be "grandes" (big, masculine plural)
* "guapo" should be "guapo" (handsome)
The corrected phrase is: "Ellos están muy grandes y guapos." This translates to "They are very big and handsome."
If you have any other Spanish phrases you'd like help with, feel free to ask!