reducer.js

import {combineReducers} from redux;

const reducer1InitialState = {
  someFoo: {
    someSubFoo: 1,
    someSubFoo2: 2
  },
  someBar: {
    someSubBar: 1,
    someSubBar2: 2
  }
}

const reducer1 = (state = reducer1InitialState, action) => {
  /* your reducer logic */
}

const reducer2InitialState = {
  someBaz: {
    someSubBaz: 1,
    someSubBaz2: 2
  },
  someFooz: {
    someSubFooz: 1,
    someSubFooz2: 2
  }
}

const reducer2 = (state = reducer2InitialState, action) => {
  /* your reducer logic */
}

export default combineReducers({
  reducer1,
  reducer2
});