Complex sentence: It was believed this would be very useful as an aid for short-range navigation to the airport, helping bombers form up after launch, as well as a way to more accurately calculate the winds for dead reckoning after the aircraft passed out of Gee range.
Split into simpler sentences: It was believed this would be very useful as an aid for short-range navigation to the airport, and helping bombers form up after launch. Additionally, after flying to altitude the bombers could use the Gee fix to calculate the winds aloft, allowing them to more accurately calculate dead reckoning fixes after the aircraft passed out of Gee range.