Complex sentence: However, a small difference in this posture could mean a lot, for example, if the same person has his/her leg crossed over the other, and places his/her entire balance on one leg, this suggests a more casual attitude.
Split into simpler sentences: However, a small difference in this posture could mean a lot. For example, if the same person has his/her leg crossed over the other, and places his/her entire balance on one leg, this suggests a more casual attitude.