According game rules, each player can perform any action (building, trading, knight activation, etc.) in any order during her/his turn.
Can an action type be done more than once in the same turn?
Example: It's John's turn:
- he activates a knight
- he builds a settlement on an harbor with 3:1 commercial ratio
- he uses such 3:1 change ratio to exchange resources with the bank
- he trades with othere players
- he builds a road
- he activates another knight
I have that conundrum since in the classic Catan, the trading phase and the building one are strictly separated and you cannot mix them up (you can just if you use advanced rules).