Complex sentence: Following the Red Planet's mechanization, he served the Zonderian Pasder as one of the Four Machine Kings, acting in plans that are seaborne or maritime-themed, though several were also themed in childish and immature ways.
Split into simpler sentences: Following the Red Planet's mechanization, he served the Zonderian Pasder as one of the Four Machine Kings. Most of the Zonders he aided in creating were seaborne or maritime-themed, though several were also themed in childish and immature ways.