Original sentence: For example, today's leading Heldenbaritone James Morris sang bass roles at the Met for years.He created a type of high dramatic bass voice typically called the Heldenbaritone (heroic baritone).He had a very strong lower range.However, many Heldenbaritone parts are no higher than (for example) the bass role of Zaccaria in Verdi's Nabucco.In almost all Italian opera the role of the high priest is a bass, as are kings and other authority figures.They may be evil or they may be noble, oftentimes both.Very often Heldenbaritones are basses who train their voices highter so as to get more interesting roles
Edited sentence: Basses are typically authority figures.But many Helden Baritone parts are no higher than for example the bass role of Zaccaria in Verdi's Nabucco.For example James Morris today's leading Helden Baritone sang bass parts at the Met for years.He created a type of high drammatic bass voice typically called the Helden (heroic) Baritone.He had very good low notes.He was a real bass not a lazy baritone.Helden Baritones.In almost all Italian opera the high priest is a bass.It is common for the baritone to be the best actor on the stage.Often the king is also a bass.Often they are both.They may be evil or they may be noble.Very often Helden Baritones are basses who push their voices up so as to get most interesting roles