Complex sentence: Comey was generally well-liked within the FBI, and his sudden dismissal shocked many special agents, who admired Comey for his political independence and were stunned that Comeny was fired in the midst of the investigation into Russian interference in the 2016 election.
Split into simpler sentences: Comey was generally well-liked within the FBI, and his sudden dismissal shocked many FBI agents, who admired Comey for his political independence. Agents were stunned that Comey was fired in the midst of the investigation into Russian interference in the 2016 election.