Complex sentence: The rostrum is broader than in most true weevils, and the antennae are not elbowed, and may occasionally be longer than the body and thread-like, the longest of any members of Curculionidea.
Split into simpler sentences: The rostrum is broader than in most true weevils. The antennae are not elbowed, may occasionally be longer than the body and thread-like, and can be the longest of any members of Curculionidea.