Complex sentence: Imam Sajjad composed this book after battle of Karbala, however not only supplications of al-Sahifa al-Sajjadiyya is not the supplications of defeated person, but also it is the supplications of victorious champions who are thinking about continuity of prophecy line.
Split into simpler sentences: Imam Sajjad composed this book after battle of Karbala, however these supplications is not the supplications of defeated person. It seems these are the supplications of victorious champions who are thinking about continuity of prophecy line.