Original:  However, it is often overlooked that the decoder only has a single view of the source sequences, that is , the representations generated by the last encoder layer , which is supposed to be a  global view of source sequences .
Revised:  However, it is often overlooked that the decoder only has a single view of the source sequences, that is , the representations generated by the last encoder layer . Although those representations are supposed to be a global view of source sequences .
Edit intent: coherence