Complex sentence: The term also refers to an improvised fortification made by felling trees or bushes, laying them in a line on their sides, with trunks anchored in the ground on the defenders' side of the line, and tree tops and branches pointing toward any attackers.
Split into simpler sentences: The term also refers to an improvised fortification made by felling whole trees or large bushes and laying them on their sides in a row. The tree trunks were generally anchored in the ground on the defenders' side of the line, with tree tops and branches pointing toward any attackers.