Complex sentence: In Penang Hokkien, there are in total five tones in unchecked syllables (high, low, rising, high falling, and low falling), which are reduced to two "entering tones" (high and low) in checked syllables.
Split into simpler sentences: In Penang Hokkien, there are in total five tones: high, low, rising, high falling, and low falling. All five occur in unchecked syllables, but are reduced to two "entering tones" in checked syllables.