Complex sentence: Adria will be responsible for the marketing and some administrative and operational tasks, however, as of now, won't directly impact the airline's operations as a whole, as the two bases will remain in Geneva and Lugano.
Split into simpler sentences: Adria will be responsible for the marketing and some administrative and operational tasks. However, as of now, this won't directly impact the airline's operations as a whole, as the two bases will remain in Geneva and Lugano.