Complex sentence: On his death without male progeny the baronetcy passed to his younger brother Sir Amyas Pollard, 3rd Baronet (1616-1701), of Abbots Bickington, Devon, upon whose death, unmarried and without legitimate male heir, the baronetcy became extinct.
Split into simpler sentences: On his death without male progeny the baronetcy passed to his younger brother Sir Amyas Pollard, 3rd Baronet (1616-1701), of Abbots Bickington, Devon. Upon the death of Sir Amyas unmarried and without legitimate male heir, the baronetcy became extinct.