Split away
Definition 1 of 2
Pro Tip 1/3Personal Decision
Used to describe a personal, often bold choice to leave a group. 
She split away from the group, seeking independence.
Pro Tip 2/3Not Always Negative
The act of splitting away isn't always bad; it can lead to growth. 
After he split away from the team, he discovered his true potential.
Pro Tip 3/3Possible Disagreement
Can imply disagreement or different goals within a group. 
They split away from the committee over differing objectives.