Complex sentence: In opposite, promises through action could be assessed by observation in regard to administrative signals (e.g. benefits packages and rewards) and organizational practices (e.g. recruitment policies, training programs, and performance reviews) might be solid promissory signals.
Split into simpler sentences: In opposite, promises through action could be assessed by observation in regard to administrative signals such as benefits packages and rewards. In addition, organizational practices like recruitment policies, training programs, and performance reviews might be solid promissory signals.