It's a tough decision on whether or not to change the colon to a semicolon. I think it's technically correct as is since the two clauses directly correlate, but either way, you would make the "o" on "others" lower case.
Some soccer scouts had been following Milhouse since
high school: others saw him for the first time on TV.
Answer:
Some soccer scouts had been following Milhouse since high school; others saw home for the first time on TV.
Explanation:
I did the problem
