Complex sentence: Guido Guinizelli and his poem "Al cor gentil repara sempre amore", whereas the major exponent of this school of poetry was Dante Alighieri, who is most famous for his "Divina Commedia".
Split into simpler sentences: Guido Guinizelli and his poem "Al cor gentil repara sempre amore". The major exponent of this school of poetry was Dante Alighieri, who is most famous for his "Divina Commedia".