You didn't give any of the information you found on the 1910 census, so I went looking.
1910 census Pittsburg Co, OK:
Clark, A.L., h, 23, M (1) 2 yrs, b TX, Eng, MS
" Louisie, w, 19, M(1) 2 yrs, 1 ch, 1 lvg, b OK, GA, US
" Herman, s, 1 2/12, b OK
Now, with that information I could see this is a match -- his name is Austin.
1920 census 211 (Monterey?) Grayson Co, TX:
Clark, Austin L., h, 33 m, b TX, __, GA
" Lous___, w, 28, m, b OK, GA, TX
" Herman, s, 11, b OK
" Vern, s, 9, b OK
" _____, s, 7, b OK
[Austin owns mortgaged home. Some of this not clear, so I put ____]
I looked at 1930 census for TX and could not find A.L./Austin, if they returned to OK I do not have access to online 1930 census for OK.If you think he stayed in TX, try the TX State Archives in Austin.They have a TX state wide death index, first section is for 1903-1940, and they can give you county and date of death in TX.
Happy Hunting (^_^)