Original sentence: Their nests are sometimes destroyed by mowing operations with eggs and young in them.These birds forage on the ground or in low to semi-low vegetation.These birds have a flute-like warbled song
Edited sentence: Their nests are, sadly, sometimes destroyed by mowing operations with eggs and young in them.These birds forage on the ground or in low, to semi-low vegetation.These birds have flute-like song  which are warbled