Complex sentence: As a shodow priest your dps is higher than that of a rogue whilst mana is avalible, a shodow priest through talents sohuld have the ability to "silence" (disable the target from casting spells).
Split into simpler sentences: As a shodow priest your dps is generally equil (if not higher) to that of a rogue whilst mana is avalible. A shodow priest through talents sohuld have the ability to "silence" (disable the target from casting spells).