Complex sentence: On New Year's Eve, she tries to move the fuel from Jack's outside toilet where she was storing it but sparks from the angle grinder that Pam is using, cause an explosion and she is knocked unconscious.
Split into simpler sentences: On New Year's Eve, she tries to move the fuel from Jack's outside toilet where she was storing it. The sparks from the angle grinder, which Pam is using, cause an explosion and Pam is knocked unconscious.