Learn Turkish: Köy halkı bu ritüeli hep sürdüregelmiş. - The village people have always maintained this ritual.

It is formed by combining the verb sürdürmek (to maintain or continue), the vowel linker -e, the auxiliary verb gelmek, and the past tense suffix -miş. The compound structure -(y)agelmek is the verb of historical continuity. It shows that the action of maintaining the ritual has been done continuously from the past right up to the present day.

Why use the -miş past tense on sürdüregelmiş instead of the definite past -di?

While -miş often means you heard something from someone else (reported past), it is also the standard tense for historical facts, traditions, and long-standing cultural norms. Because this ritual spans generations and began before the speaker's direct observation, -miş is the most natural and grammatically correct choice here.

Is the word hep (always) redundant since the verb already implies continuous action?

Grammatically it is a bit redundant, but this kind of repetition is very common and natural in Turkish for emphasis. Adding hep strongly reinforces the unbroken, continuous nature of the tradition that is already expressed by the -(y)agelmek suffix.

Why does ritüel take the -i suffix here to become ritüeli?