Hello I think two thoughts of yours are complementary to each other. Your sentence can be analyzed like: S I { VP decided [ NP PRO to take low-paid work]} Here, PRO is a hidden pronoun. "PRO to take low-paid work" is a NP working as the object of "decided".
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Anonymousmy suggestion for your tree diagramIt works for me! (But it may be too late to help the original poster - November 13, 2005.)