Complex sentence: As of 2015, Mark is still in the prison system, meaning he has been incarcerated for 34 years, 27 of which were in solitary confinement in the "X" wing of Florida State Prison.
Split into simpler sentences: As of 2015, Mark is still in the prison system. Meaning he has been incarcerated for 34 years, 27 of which were in solitary confinement in the "X" wing of Florida State Prison.