Complex sentence: A meadow is a field vegetated primarily by grass and other non-woody plants (grassland) and which is not grazed by domestic livestock but rather allowed to grow unchecked in order to make hay.
Split into simpler sentences: A meadow is a field vegetated primarily by grass and other non-woody plants (grassland). In agriculture a meadow is grassland which is not grazed by domestic livestock but rather allowed to grow unchecked in order to make hay.