Complex sentence: On 5 November 2017, White returned to NJPW as the mysterious "Switchblade", who had been teased for the past several months, attacking IWGP Intercontinental Champion Hiroshi Tanahashi at the end of Power Struggle.
Split into simpler sentences: On 5 November 2017, White returned to NJPW as the mysterious "Switchblade", who had been teased for the past several months. He challenged and attacked IWGP Intercontinental Champion Hiroshi Tanahashi at the end of Power Struggle.