Complex sentence: Hamza and Zainab are totally shocked to discover that Alvira could go to this stage of actually reaching the Court, which leads to Zainab's suspicion that Shahnawaz has filed the case.
Split into simpler sentences: Hamza and Zainab are totally shocked to discover that Alvira could go that far to this stage of actually reaching to the court. This leads to Zainab's suspicion that Shahnawaz has filed the case.