Complex sentence: In face-to-face positions of the couple, the follower generally "mirrors" the leader's footwork, i.e., if the leader begins on the left foot, the follower will begin on the right foot.
Split into simpler sentences: In face-to-face positions, the follower generally "mirrors" the leader's footwork. For example, if the leader begins on their left foot, the follower will begin on their right foot.