This is more complicated than I thought because there are two Thomas Arnolds both born in Holybourne around 1790. They might have been cousins. They died in 1853 and 1854 respectively just to confuse things further.
One certainly married Jane Trimmer in 1811
England Marriages 1538-1973, Chawton, Hampshire, England
First name(s) Thomas
Last name Arnold
Marriage year 1811
Marriage date 04 Nov 1811
Marriage place Chawton
Spouse's first name(s) Jane
Spouse's last name Trimmer
Residence Hampshire, England
https://www.findmypast.co.uk/transcript?id=R_846837165 FindMyPast (no image)
I think this is the Thomas Arnold living in Chawton in the 1841 and 1851 censuses. He is 63 in 1851 so born around 1788.
"England and Wales Census, 1841," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M793-61L : 6 March 2021), Thomas Arnold, Chawton, Hampshire, England, United Kingdom; from "1841 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives, Kew, Surrey
"England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SGP2-HBJ : 12 September 2019), Thomas Arnold, Chawton, Hampshire, England; citing Chawton, Hampshire, England, p. 11, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey
Also I think that this Thomas's death is more likely the one in 1853 not 1854 as it specifies the location of Chawton, but that's not definite.
England Deaths & Burials 1538-1991, Chawton, Hampshire, England
First name(s) Thomas
Last name Arnold
Event year 1853
Burial year 1853
Burial date 17 Oct 1853
Burial place Chawton, Hampshire, England
https://www.findmypast.co.uk/transcript?id=R_273275215 FindMyPast (no image)
The other Thomas Arnold married Elizabeth Bowen or Bower in 1815.