"A crowd of animals formed around me with expressed perplexity, unsure of what to do." Does this make sense? IF yes, tell me why (and show me what you understand) IF no, tell me why and suggestions.

What does the word precocious mean in this sentence

What is the problem with the following sentence: cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.

This is a set of words that begins with a preposition.