In which year did the Surat Split happen? What was the result of this split?

The Surat Split took place in 1907, at the Surat session of the Indian National Congress.

Result: the Congress split into two groups — the Early Nationalists (Moderates) led by Gopal Krishna Gokhale and the Assertive Nationalists (Extremists) led by Bal Gangadhar Tilak. The Assertive Nationalists were expelled, the Congress was weakened and its influence declined, and the British took advantage of the division; the two groups were reunited only at the Lucknow session of 1916.

One mark for the year and one for the result. For the result, give the split into two groups AND its consequence — a weakened Congress that the British could exploit. Naming the leaders of each faction makes the answer precise. The reunion at Lucknow in 1916 is worth a closing phrase, since it completes the story and links to the Lucknow Pact of the same session.