what is the meaning of the phrase but the worlds they came from were just too different

Kelas: SMA
Pelajaran: English
Kategori: meaning of phrase
Pembahasan: 

To get the meaning of this complex sentence, you might need to find the part of sentence first like the subject, predicate, object. 
The subject of that sentence is ' the worlds (where) they came from.'
The to be 'were' 
and the complement is 'just too different.'
It means that they came from the worlds (which might be the life with its culture, habits, customs and general views) that is very different from where they are now. 
Possible example of this case is the Arabian girls leaving their home country in Saudi Arabia and now they live in Sweden, which is well-known for its liberal life style, including gender neutrality policy.