Complex sentence: Here they first heard of the death expedition of al-Alfi, upon whose co-operation they had founded their chief hopes of success; and they immediately despatched messengers to his successor and to the other beys, inviting them to Alexandria.
Split into simpler sentences: Here they first heard of the death expedition of al-Alfi, upon whose co-operation they had founded their chief hopes of success. They immediately despatched messengers to his successor and to the other beys, inviting them to Alexandria.