en_tn_condensed/num/03/51.md

the redemption money

This refers to the money that Moses collected. Some translations use "ransom".

to his sons

Here "his" refers to Aaron

he was told to do by Yahweh's word, as Yahweh had commanded him

These two phrases mean basically the same thing and are combined for emphasis.

he was told to do by Yahweh's word

"that Yahweh had told him to do"