Complex sentence: Some variants of the triple option have now made the jump to the shotgun formation, which has become a popular option formation since Eric Crouch and the University of Nebraska Cornhuskers used the shotgun option during his 2001 Heisman campaign.
Split into simpler sentences: Some variants of the triple option have now made the jump to the shotgun formation. The Shotgun has become a popular option formation since Eric Crouch and the University of Nebraska Cornhuskers used the shotgun option during his 2001 Heisman campaign.