Because moraines were formed at melting ice fronts, their sediments were deposited in a jumble of sand, gravel, mud and detached blocks of glacier ice.
(moraines; were formed; T:at melting ice fronts) (moraines; at melting; ice fronts) (their sediments; were deposited; in a jumble of sand, gravel, mud and detached blocks of glacier ice)
moraines moraines their sediments
were formed at melting were deposited
T:at melting ice fronts
ice fronts
in a jumble of sand, gravel, mud and detached blocks of glacier ice