Original sentence: A static horizontal stabilizer may be placed either behind the center of mass, as a tailplane, or forward of it as a canard foreplane.In some cases the foreplane acts with the other horizontal surfaces to provide longitudinal (or "pitch") stability, in which case it acts as a stabilizer.Static vertical stabilizers are small wing surfaces placed behind the center of mass of an aircraft, either as part of the tail empennage or outboard on aft-swept wings.The tailplane is a small horizontal wing attached to an aircraft, which acts with the other horizontal surfaces to provide longitudinal (or "pitch") stability
Edited sentence: Static vertical stabilizer is wing surface placed behind the center of mass of an aircraft, either as part of the tail empennage or outboard on aft-swept wings.The horizontal stabilizer or tailplane is a small horizontal wing attached to an aircraft, which acts with the other horizontal surfaces to provide longitudinal (or "pitch") stability