The practice that can help you past your learned bad habits of trying to edit as you write is what Elbow calls free writing.

　　主干：The practice...is what...

　　定語從句that can...修飾主語The practice,從句中的介詞短語 past your...habits作賓語you的補語，as you write引導的時間狀語從句修飾trying to edite。what引導的表語從句中用了call+賓語+補語的結構，what是賓語，free writing是補語。

　　譯文：這種可以幫助你克服在寫作的同時就試圖編輯的壞習慣的做法便是Elbow所稱作的自由式寫作。