how could i change or rephrase the passage to be better and sound better?

i know i have reposted this for the third time i just really need help with it and cant come up with anything that sounds better and im under a time rush ): i did write the below once already in my lecture and would just like to repeat it

so with that new info added how can i change "as previously stated were used" and "which is again" i hate the way they sound and know their are better phrases and words to use i just really cant think of any i

the overall objective of the studies conducted as previously stated were used to try and solve the question which is again; does watching violence on tv cause adolescents to become more aggressive or are adolescents who are more aggressive simply more likely to enjoy violence on tv?