TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: He has been on the Chrysanthemum Throne since his father Akihito abdicated in 2019 .

SOLUTION: He acceded to the Chrysanthemum Throne upon the abdication of his father , the now-Emperor Emeritus Akihito on 1 May 2019 at 00:00 local time ( 15:00 UTC ) .

PROBLEM: In criminal trials , the insanity defense is the claim that the defendant is not responsible for his or her actions due to a mental illness .

SOLUTION: The insanity defense , also known as the mental disorder defense , is an affirmative defense by excuse in a criminal case , arguing that the defendant is not responsible for his or her actions due to an episodic or persistent psychiatric disease at the time of the criminal act .

PROBLEM: Metre per second is an SI unit of measurement of both speed and velocity .

SOLUTION:
The metre per second ( American English : meter per second ) is an SI derived unit of both speed ( scalar ) and velocity ( vector quantity which specifies both magnitude and a specific direction ) , defined by distance in metres divided by time in seconds .

