reword
They also tend to avoid hobbies that they once enjoyed doing and become more isolated from family and friends.
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They also tend to avoid hobbies that they once enjoyed doing and become more isolated from family and friends.
1 answer 
Yes, doing is redundant. If you prefer not to flesh out a second complete independeant clause, you could also write:
They tend to avoid hobbies that they once enjoyed and become isolated from family and friends.
This way you're using tend to apply elliptically to the second idea:
They tend to avoid . . .
They tend to become . . .
It depends whether you consider the becoming isolated to be a a tendency as well as the avoidence of hobbies.
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edited Oct 09 '12 at 08:18
Peter Guess
Expert
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