pp

ppを使うとプリティプリントができます。

require 'pp'

a = {
  "Bobby" => 19,
  "Elvis" => 19,
  "Grimm" => 19,
  "Fredy" => 19,
  "Haris" => 13,
  "David" => 13,
}

b = {
  "Alice" => 13,
  "Chris" => 16,
}

people = [ a, b ]

p people
pp people

実行結果です。デフォルトでは幅が79でプリティプリントするとのこと。

[{"Grimm"=>19, "David"=>13, "Fredy"=>19, "Elvis"=>19, "Bobby"=>19, "Haris"=>13}, {"Alice"=>13, "Chris"=>16}]
[{"Grimm"=>19,
  "David"=>13,
  "Fredy"=>19,
  "Elvis"=>19,
  "Bobby"=>19,
  "Haris"=>13},
 {"Alice"=>13, "Chris"=>16}]