Complex sentence: Pit looms are looms which are fixed in the ground level and there will be a pit in which looms peddle will be placed and the weaver will sit on the floor and use his hands and legs to weave.
Split into simpler sentences: Pit looms are looms which are fixed at the ground level and there is a pit in which the loom's pedal is placed. The weaver will sit on the floor and use her hands and legs to weave.