Complex sentence: Some of the early observers described the Hadza as having chiefs or big men, but they were probably mistaken; more reliable accounts portray early 20th century Hadza as egalitarian, as they are today.
Split into simpler sentences: Some of the early observers described the Hadza as having chiefs or big men, but they were probably mistaken. The more reliable accounts portray the early 20th century Hadza as egalitarian, as they are today.