Star wars episode 3: could darth sidious have brought padame back to life?

Nope. Because she was never actually dead. Obi-Wan had put her in a state of suspended animation,to fool the Emperor and Darth Vader. She was then taken to Alderann where she lived with Leia in secrecy.She most likely died when the twins were three years old,giving Leia her few precious memories of her mother. ( george lucas is a moron)