Original: On August 7, 1942, Allied forces, predominantly American, initiated landings on the islands of Guadalcanal, Tulagi, and Florida (Nggela Sule) in the southern Solomon Islands with the objective of denying their use by the Japanese as bases to threaten supply routes between the U.S., Australia, and New Zealand.
Simplified: On August 7, 1942, Allied forces, mainly from the United States, started landings on the islands of Guadalcanal, Tulagi, and Florida in the southern Solomons with the aim to make supply routes between the U.S., Australia, and New Zealand safer.