Complex sentence: The Garden path effect occurs when a sentence that is grammatically correct (syntactically correct) but is worded in a way that leads the reader's most likely interpretation of the sentence to be incorrect causing the reader to go back and look for another interpretation.
Split into simpler sentences: The Garden path effect occurs when a sentence that is grammatically correct (syntactically correct) but is worded in a way that leads the reader's most likely interpretation of the sentence to be incorrect. This causes the reader to go back and look for another interpretation.