Complex sentence: However Lizzie suddenly starts to behave aggressive against the school, her brother become a robotics genius and their recent made friend Ethan became a soccer star, but when they try to talk, or even think, about those sudden changes their minds goes blank.
Split into simpler sentences: However Lizzie suddenly starts to behave aggressive against the school, her brother becomes a robotics genius and their recent made friend Ethan becomes a soccer star. But when they try to talk, or even think about those sudden changes, their minds goes blank.