"
Beautiful Mother,
Soft and sweet, once you were gone
We were not complete
Back through the years
We reached for you
Alas, t'was not meant to be
And
This time Ed is talking about their mother who is the reason why Ed and Al did this. He is describing her personality.
When she died the brothers felt empty.
That's when they attempted human alchemy (the thing that was forbiden to do, bringing the dead to life).
That's when it all backfired and the catastrophe happened.
Still per sentence.