Nonetheless, Darwin had been thinking about change since his visit to the Galapagos Islands in 1835) and when Charles Darwin was fifty years old, in 1859, the first edition of On The Origin of Species was published.
(Darwin; had been thinking; about change; T:since his visit to the Galapagos Islands in 1835) (Charles Darwin; was; fifty years old; T:in 1859)
Darwin Charles Darwin
had been thinking was
about change T:since his visit to the Galapagos Islands in 1835
fifty years old T:in 1859