Complex sentence: Earlier methods such as lexicostatistics and glottochronology have been proved to be premature and inaccurate, however, recent inter-disciplinary studies which borrow concepts from biological studies, especially gene mapping, have proved to produce more sophisticated analytical tools and more trustful results.
Split into simpler sentences: Earlier methods such as lexicostatistics and glottochronology have been proven to be premature and inaccurate. However, recent interdisciplinary studies which borrow concepts from biological studies, especially gene mapping, have proved to produce more sophisticated analytical tools and more trustful results.