Complex sentence: Both sides sought Ethiopian support: the Central Powers wanted the Ethiopians to drive the Italians out of Eritrea, and rumors circulated that in return for Iyasu invading Sudan with 50,000 soldiers that he would be rewarded with the strategic port of Djibouti.
Split into simpler sentences: Both sides sought Ethiopian support: the Central Powers wanted the Ethiopians to drive the Italians out of Eritrea. Rumors circulated that, in return for Iyasu invading the Sudan with 50,000 soldiers, that he would be rewarded with the strategic port of Djibouti.