Complex sentence: Plank resurfaces within a year of the mid-point of the Tribulation, using the name Pinkerton Stephens, and ostensibly an operative serving the GC in Pueblo, Colorado.
Split into simpler sentences: Plank resurfaces within a year of the mid-point of the Tribulation. However, he is now using the name Pinkerton Stephens, and ostensibly serves as an operative of the GC in Pueblo, Colorado.