Complex sentence: Scahill served as an election correspondent for HBO's "Real Time with Bill Maher" and has twice testified before the US Congress on the U.S. government's use of mercenary forces.
Split into simpler sentences: Scahill served as an election correspondent for HBO's "Real Time with Bill Maher". Scahill has twice testified before the US Congress on the U.S. government's use of mercenary forces.