Complex sentence: Germany for example would have to pay an additional €4.5 billion for 2019 and again for 2020; in addition the UK would no longer be a shareholder in the European Investment Bank, in which only EU members can participate.
Split into simpler sentences: Germany for example would have to pay an additional €4.5 billion for 2019 and again for 2020. In addition the UK would no longer be a shareholder in the European Investment Bank, in which only EU members can participate.