Complex sentence: United States military supplies were collected in Florida, transported through South America to Brazil, then flown from Brazil to the military depot at Roberts Field, where 5,000 African-American troops stored and maintained the inventory.
Split into simpler sentences: United States military supplies were collected in Florida, transported through South America to Brazil, then flown from Brazil to the military depot at Roberts Field. There 5,000 United States African-American troops stored and maintained the inventory.