"Does Jane walk to school?" is the Engpsh equivalent of "简是步行去学校吗?"。
"Jane" is the name of a person, and "walk" is a verb meaning to move on foot. "To school" is a prepositional phrase indicating the destination. "Does" is an auxipary verb that is used to form questions in the present tense.
Examples:
"Does Jane walk to school every day?" 简每天都步行去学校吗？
"I wonder if Jane walks to school." 我想知道简是否步行去学校。
"Jane usually walks to school, but today she's taking the bus." 简通常步行去学校，但今天她要坐公交车。