YOU SAID:
Natalie is so tired she ate a pizza
INTO JAPANESE
ナタリーはとても疲れているのでピザを食べました
BACK INTO ENGLISH
Natalie was so tired that she ate pizza
INTO JAPANESE
ナタリーはとても疲れていたのでピザを食べました
BACK INTO ENGLISH
Natalie was so tired that she ate pizza
That didn't even make that much sense in English.