Complex sentence: There, Neretvian emissaries requested the release of the prisoners, if the Neretvian Archont himself came to bow, renounce the old tax that Venetia had to pay since 948 and guarantee safe passage to Venetian ships in the Adriatic.
Split into simpler sentences: There, Neretvian emissaries requested the release of the prisoners. Moreover, the Neretvians would also have to renounce the old tax that Venetia had to pay since 948, and guarantee safe passage to Venetian ships in the Adriatic.