Complex sentence: This in turn causes Christopher Moltisanti to express frustration and jealousy in front of his fiancée Adriana La Cerva, who then gives her FBI handler Agent Sanseverino a phone call.
Split into simpler sentences: This in turn causes Christopher Moltisanti to express frustration and jealousy in front of his fiancée Adriana La Cerva. Adriana is then seen giving her FBI handler Agent Sanseverino a phone call.