Complex sentence: In mathematics, the Hessian group is a finite group of order 216, introduced by who named it for Otto Hesse, given by the group of determinant 1 affine transformations of the affine plane over the field of 3 elements.
Split into simpler sentences: In mathematics, the Hessian group is a finite group of order 216, introduced by who named it for Otto Hesse. It may be represented as the group of affine transformations with determinant 1 of the affine plane over the field of 3 elements.