Complex sentence: In March 2014, almost 29 years after the events and almost three years after the death of Mrs. Groce, the Metropolitan Police publicly apologised to her family for the wrongful shooting of Mrs Grace.
Split into simpler sentences: In March 2014, almost 29 years after the events, and almost three years after the death of Mrs. Groce, the Metropolitan Police made a public apology for the shooting. Subsequently, the Metropolitan Police publicly apologised in March 2014 to her family for the wrongful shooting of Mrs Grace.