Yes, the sentence "Language learning depends on repeated imitations" is grammatically correct. However, it's worth noting that while imitation is indeed an important aspect of language learning, it is not the sole factor. Language learning is a complex process that involves various elements such as listening, speaking, reading, writing, vocabulary acquisition, grammar understanding, and practical application.

If you want to provide a more comprehensive view, you might say something like: "Language learning involves repeated imitations along with other key elements such as vocabulary building, grammar understanding, and practical communication." This way, you acknowledge the importance of imitation while also highlighting the multifaceted nature of language learning.