Why are shakespeares plays considered more difficult for modern students to understand

The choice of word/jargon is harder to understand

Explanation: Shakespeare often used phrases that were somewhat normal in the time that he wrote them, but overtime, the English language has evolved into what it is today. This means no tongue twisters and rhymes that we don't understand or cutting words in half like "'til morrow"

he used words or phrases some people wouldnt understand.

Explanation:

answer; (b); the abolitionist movement;