Complex sentence: This type of accent is known incorrectly as marcato by many classically-based musicians, and even as just a "rooftop accent" by those not knowing its name, but it is correctly known as martelato or martellato, which is Italian for "hammered".
Split into simpler sentences: This type of accent is known incorrectly as marcato by many classically-trained musicians, and even as just a "rooftop accent" by those not knowing its name at all. It is correctly known as martelato or martellato, which is Italian for "hammered".