Какое краткое содержание?
Вот это, пожалуй, ключевое:
1. Non-EU family members will be allowed entry strictly by an invitation from an EU citizen/resident relative.
2. The EU relative will take full responsibility for the costs incurred by the invitees.
3. The non-EU family members will be obliged to undergo a Covid-19 test upon entry. They will also quarantine for 14 days at the place of residence of their EU relative.