Complex sentence: In his book "PIHKAL" (Phenethylamines I Have Known and Loved), Shulgin lists the dosage range as 8 to 12 mg.2C-T-21 is generally taken orally, and effects typically last 7 to 10 hours.
Split into simpler sentences: In his book "PIHKAL" (Phenethylamines I Have Known and Loved), Shulgin lists the dosage range as 8 to 12 mg.2C-T-21 is generally taken orally. According to Shulgin, the effects of 2C-T-21 typically last 7 to 10 hours.