Complex sentence: Dexter, reading between the lines understands that only Connor Fitzgerald would pose a threat to her long held position in Langley, so she conceives a plan to have him assassinated, thus in order to remove the last shred of evidence.
Split into simpler sentences: Dexter, reading between the lines understands that only Connor Fitzgerald would pose a threat to her long held position in Langley. She conceives a plan to have him assassinated, thus in order to remove the last shred of evidence.