Complex sentence: The next day at Joe's lecture, Jed tuns up in the class and sings to Joe they then go outside and Jed talks about how Joe is sending him signals, using a curtain reference.
Split into simpler sentences: The next day at Joe's lecture, Jed tuns up in the class and sings to Joe. They then go outside and Jed talks about how Joe is sending him signals, using a curtain reference.