Complex sentence: After college, he served in the US Army before returning to Hawaii, where he initially worked at the Koolau Ranch on Kauai seven years and then operated a commercial fishing vessel on Kauai for another seven years.
Split into simpler sentences: After college, he served in the US Army before returning to Hawaii. Upon returning to Hawaii, Robinson worked Koolau Ranch on Kauai seven years and operated a commercial fishing vessel on Kauai for another seven years.