Complex sentence: That man inwardly turn to God and be led by him seems to be the main purpose of Eckhart's exhortations to let no one think that because this or that great saint has done and suffered many things, he should imitate him.
Split into simpler sentences: That man inwardly turn to God and be led by him seems to be the main purpose of Eckhart's exhortations. To let no one think because this or that great saint has done and suffered many things, that he should imitate him.