Add spaces between the words in the following text: ThislinktoAlexandriawasimportantbecauseitrequiredfrequentcommunicationbetweentheNubiankingdomsandAlexandria.ArabinvadersconqueredEgyptin640andsoonattemptedunsuccessfullytoconquertheNubiankingdoms.
This link to Alexandria was important because it required frequent communication between the Nubian kingdoms and Alexandria. Arab invaders conquered Egypt in 640 and soon attempted unsuccessfully to conquer the Nubian kingdoms.