Complex sentence: Proper striking procedures should be followed as well, such as calling out whenever a light is turned on to warn those around, and ensuring that the header cable is properly and securely connected (most header cables will twist and click into place).
Split into simpler sentences: Proper striking procedures should be followed as well, such as calling out a vocal warning whenever a light is turned on to warn persons in the area. Also, the header cable should be properly and securely connected (most header cables will twist and click into place).