Final answer:
The correct revision of sentence 4 with an introductory phrase is 'In Shakespeare's day, this type of play was a real crowd-pleaser.'
Step-by-step explanation:
The correct revision of sentence 4 using an introductory phrase is: In Shakespeare's day, this type of play was a real crowd-pleaser. This revision neatly provides a time context for the popularity of the revenge tragedy without fragmenting the sentence structure. It's important to use a comma after the introductory phrase to separate it from the main clause, ensuring the sentence flows naturally and adheres to conventional English grammar rules.
In Shakespeare's day, this type of play was a real crowd-pleaser. Audiences found enjoyment in the choreography of staged combat, the elegance of the playwrights' poetic language, and the emotional catharsis associated with the genre. Shakespeare's achievement in Hamlet was to elevate this form of popular culture into a literary masterpiece.