Sieving, handpicking, and filtration are some simple physical methods to separate heterogeneous mixtures
Sieving is typically used to separate particles by size through a mesh, like what you see near construction sites.
Filtration is a method used to separate insoluble solid from liquids using filter paper.
Handpicking is a method used to separate a mixture using hands.
There’s also distillation which is a process to separate components of a homogeneous mixture. It involves heat and a sophisticated apparatus, which is why it’s not considered a simple method.