I paraphrased it below. Its tricky alright. But its tough to write good laws.
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Pass is complete, if player is inbounds and:
A. Secures ball in hands or arms before ball hits ground, and
B. Touches ground inbounds with two feet or any part of body other than hands, and
C. Maintains control of ball after a and b have been fulfilled, UNTIL he
has the ball long enough to clearly become a runner, — ie,
when his second foot is on ground,
he is capable of avoiding or warding off impending contact of opponent,
tucking ball away,
turning up field,
or taking additional steps
IF player has control of ball, a slight movement of ball will not be considered loss of possession
If player loses the ball while simultaneously touching both feet or body part to ground, it is not a catch