YOU SAID:
dark places are smelly
INTO JAPANESE
暗い場所は臭いがする
BACK INTO ENGLISH
A dark place smells
INTO JAPANESE
暗い場所で匂いがする
BACK INTO ENGLISH
I smell in a dark place
INTO JAPANESE
私は暗い場所で臭いがする
BACK INTO ENGLISH
I smell in a dark place
That didn't even make that much sense in English.