And our own human development needs to find its natural template of growth like the vine needs the trellis as its framework to climb up and grow Weve been on this quest some of us for nearly three decades and so far 16 definite levels of elevation have been charted each level a rung up the ladder of human development

What is the correctly punctuated version of this sentence?
And our own human development needs to find its natural template of growth, like the vine needs the trellis as its framework to climb up and grow. We've been on this quest, some of us for nearly three decades, and so far 16 definite levels of elevation have been charted, each level a rung up the ladder of human development.