ข้อตกลงนี้มีข้อแม้หนึ่งข้อ
This agreement has one condition.

 ข้อตกลง = agreement; deal; terms
● ข้อ = item; point
● ตกลง = to agree; to settle
○ ตก = to fall; to drop
○ ลง = down; to descend

 นี้ = this

 มี = to have; there is; there are

ข้อแม้ = condition; proviso; catch
● ข้อ = item; point
● แม้ = even if; although

หนึ่ง = one

 ข้อ = item; point; clause; classifier for points, conditions, and questions

 Note: ข้อ is part of compounds such as ข้อตกลง and ข้อแม้, but the final ข้อ is a classifier counting the condition.