Complex sentence: John Tebbutt (May 25 1834--November 29 1916) was an Australian astronomer, credited with discovering the "Great Comet of 1861" (C/1861 J1).
Split into simpler sentences: John Tebbutt (May 25 1834--November 29 1916) was an Australian astronomer. He is credited with discovering the "Great Comet of 1861" (C/1861 J1).