Complex sentence: D'Arcy was initially nervous about portraying Jarvis's comedic side, given his history of "predominantly play (ing) psychopaths", and did not study Paul Bettany's performance as J.A.R.V.I.S. when approaching the character.
Split into simpler sentences: D'Arcy was initially nervous about portraying Jarvis's comedic side, given his history of "predominantly play (ing) psychopaths". He did not study Paul Bettany's performance as J.A.R.V.I.S. when approaching the character.