Complex sentence: When Sir Philip Sidney begins a sonnet with the conventional idiomatic expression "My true-love hath my heart and I have his", he takes the metaphor literally and teases out a number of literal possibilities in the exchange of hearts.
Split into simpler sentences: When Sir Philip Sidney begins a sonnet with the conventional idiomatic expression "My true-love hath my heart and I have his". He takes the metaphor literally and teases out a number of literal possibilities in the exchange of hearts.