Complex sentence: Harold Jacobs 270,271 Ron Jacobs 108 Grathwohl 177 Donghi and others had been suspicious of Grathwohl, who was in fact an undercover FBI agent who had to blow his cover in order to make the arrest.
Split into simpler sentences: Harold Jacobs 270,271 Ron Jacobs 108 Grathwohl 177 Donghi and others had been suspicious of Grathwohl, who was in fact an undercover FBI agent. Grathwohl had to blow his cover in order to make the arrest.