You can redeem more than one bonus and you can also have several active bonuses at the same time. However, keep in mind that each bonus has its own rollover conditions which need to be fulfilled within the required time frame. Otherwise, your bonus funds will be cancelled.
Furthermore, a withdrawal of your winnings will only be possible once all bonuses have been rolled over.
You can also have active free bets and bonus funds at the same time, but they cannot be combined in a bet.