Complex sentence: Nunca is a collection of poems were a variety of forms coexist, the author exudes satisfaction with myriad new subjects, new forms, and new themes, convinced that he has achieved dominance over classic form, especially the sonnet.
Split into simpler sentences: Nunca is a collection of poems in which a variety of forms coexist. The author exudes satisfaction with myriad new subjects, new forms, and new themes, convinced that he has achieved dominance over classic form, especially the sonnet.