Complex sentence: As evidence for this he mentions some mythological prominent heroes and lovers like Achilles sacrificing to avenge Patroclus and Alcestis willing to die for her husband Admetus.
Split into simpler sentences: As evidence for this he mentions some mythological prominent heroes and lovers. Even Achilleswho was the beloved of Patroblus, sacrificed himself to avenge his lover, and Alcestis was willing to die for her husband Admetus.