Complex sentence: Proficiency of your character is generally acquired through exercising skills in a way you have not used before, for example, using abilities and spells in battle can make you good at using them and unlock more skills for the fruit of your labor.
Split into simpler sentences: Proficiency of your character is generally acquired through exercising skills in a way you have not used before. For example, using abilities and spells in battle can make you good at using them and unlock more skills for the fruit of your labor.