Simplify the following text for a Grade 13 native English-speaking person.
Original: He and his associate John Hayes Hammond led novel game expeditions to Africa with the goal of finding large animals such as Giant Eland , hippopotamus , zebra , and various bird species that might be bred in the United States and become game for future American sportsmen .
Simplified: He and John Hayes Hammond left for Africa to bring back to the United States large animals such as Giant Eland , hippopotamus , zebra , and various bird species for breeding for future hunting .