2 sentences

1. 他是这次文化节的主策划人。

   tā shì zhè cì wén​huà​jié de zhǔ cè​huà​rén.

   He is the lead planner for this cultural festival.

   Source: Dong Chinese Dictionary

2. 他被指控为这起政变的幕后策划人。

   tā bèi zhǐ​kòng wéi zhè qǐ zhèng​biàn de mù​hòu cè​huà​rén.

   He was accused of being the mastermind behind the coup.

   Source: Dong Chinese Dictionary