Complex sentence: Bass instrument speaker cabinets typically are more rigidly constructed and heavily braced than cabinets for non-bass instrument amplification, and bass cabinets usually include tuned bass reflex ports or vents for increased efficiency at low frequencies.
Split into simpler sentences: Bass instrument speaker cabinets typically are more rigidly constructed and heavily braced than cabinets for non-bass instrument amplification. Bass cabinets usually include tuned bass reflex ports or vents for increased efficiency at low frequencies.