Complex sentence: A study done by Peter Ward in 1963 observed some birds failing to individually find sufficient food in the morning and later in the afternoon, after resting in a secondary roost, joins other birds and flies off in a completely different direction.
Split into simpler sentences: A study done by Peter Ward in 1963 observed some birds failing to individually find sufficient food in the morning and later in the afternoon. However, after resting in a secondary roost, they joined other birds and flew off in a completely different direction.