Complex sentence: It is considered the most important exponent of liscio romagnolo (literally "smooth", a name that some attribute to a style of dance) and is the author of the famous popular song "Romagna mia".
Split into simpler sentences: It is considered the most important exponent of liscio romagnolo (literally "smooth", a name that some attribute to a style of dance). He's the author of the famous popular song "Romagna mia".