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Does James own less company shares than Sarah does?
Let number of shares of James= J, Sarah= S

(1) Sarah owns more than 500 shares of the company.
This only gives S>500
Hence insufficient
(2 ) James owns 400 less than twice the number of shares that Sarah owns.
This gives J + 2*S-400
Hence J+400 = 2*S

Now if J =2, S= 201 (J<S)
Also if J=800, S =600 (J>S)
Hence insufficient

(1) and (2)
S>500
Let S=500, J = 600
Above 500, for all values of S, J>S
Hence sufficient
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