Complex sentence: At the Olympic Games, she performed subpar--partially due to a strained hamstring suffered during podium training--falling off beam and floor in qualifying, failing to qualify into the individual all around or any of the event finals, as many expected her to.
Split into simpler sentences: At the Olympic Games, she performed subpar, partially due to a strained hamstring suffered during podium training. In the qualifying session she fell off of the beam and again on floor, failing to qualify into the individual all around or any of the event finals as many expected her to.