The sentence "Estimators have to be good at analyzing and organizing information" contains the following complements/complementary phrases:

• "good at analyzing and organizing information": This is an adjective phrase acting as a subjective complement. It describes the state of being of the subject "Estimators" after the linking verb "to be." "Good" is the adjective, and "at analyzing and organizing information" is a prepositional phrase modifying "good," specifying how good the estimators are. Within this prepositional phrase, "analyzing and organizing information" functions as a gerund phrase acting as the object of the preposition "at." "Analyzing" and "organizing" are parallel gerunds, both taking "information" as their object.

• "analyzing information": This is a gerund phrase functioning as part of the larger adjective phrase described above. It's a gerund phrase because it's a verbal (derived from the verb "analyze") acting nominally (as a noun). "Information" is the object of the gerund "analyzing."

• "organizing information": This is another gerund phrase, parallel to "analyzing information," and also functioning as part of the larger adjective phrase. Similar to the previous gerund phrase, "information" is the object of the gerund "organizing."

• "information": While not strictly a phrase, "information" functions as the object of both gerunds ("analyzing" and "organizing") within the larger adjective phrase. It's crucial to the meaning of the complement.

Therefore, the sentence's main complement is a complex structure built from an adjective phrase, which itself contains two parallel gerund phrases, each with its own object. The object of the gerunds is also a key component of the overall complement.