Zermelo made other fundamental contributions to axiomatic set theory which were partly a consequence of the criticism of his first major contribution to the subject and partly because set theory began to become an important research topic at Gttingen The set theory paradoxes first appeared around 1903 with the publication of Russell s paradox

What is the correctly punctuated version of this sentence?
Zermelo made other fundamental contributions to axiomatic set theory which were partly a consequence of the criticism of his first major contribution to the subject and partly because set theory began to become an important research topic at Gottingen. The set theory paradoxes first appeared around 1903 with the publication of Russell 's paradox.