Complex sentence: Together with sura Al-Falaq it is also known as Al-Mu'awwidhatayn; dealing with roughly the same theme, they form a natural pair.
Split into simpler sentences: Together with sura Al-Falaq it is also known as Al-Mu'awwidhatayn. It and Surat al-Falaq are together termed the mu'awwidhatayn; dealing with roughly the same theme, they form a natural pair.