Sussex reached 186-5 in reply to Durham's 164 on day one of the County Championship fixture at Hove.
Somerset were reduced to 197-7 in their second innings, a lead of 78, against Sussex at stumps on day two.
Sussex have agreed new two-year contracts with seamers James Anyon and Chris Liddle.
Seam bowler James Anyon has moved to Sussex on a two-year contract after Warwickshire agreed to release him.
Seam bowler James Anyon has signed a new two-year contract with Warwickshire.
James Anyon has been recalled to the Warwickshire squad for their LV County Championship clash against Leicestershire.
Tri-Series in Australia 2015
Australia win by 112 runs
Australia and New Zealand will co-host the 2015 Cricket World Cup from February - here's a taster of what's in store.
England can take great heart from reaching Sunday's Tri-Series final with a tough win over India, says David Lloyd.
David Lloyd raises a glass to the 'Tubby' Taylor wine tour, the BBL and England's showdown with India.
England's World Cup opponents will not relish the return of fit-again James Anderson, says Nick Knight.
Bob Willis says AB de Villiers could well be the best batsman of all time after blasting a record ODI ton off 31 balls.
As England fly off to Australia, Nasser Hussain explains why 2015 is a year to savour...
Sky Sports' cricket experts have picked their favourite hundreds from previous World Cups. Do you agree with their choices?