As the Earth goes round the sun during the year its North-South axis tilts towards or away from the sun, with the Northern hemisphere pointing more towards the sun during the summer and the Southern hemisphere pointing more towards the sun during the winter.
(the Earth; goes; round; T:the sun during the year) (the Northern hemisphere; pointing; more; towards the sun; T:during the summer and the Southern hemisphere) (its North-South axis tilts towards or away from the sun; pointing; more; towards the sun; T:during the winter)
the Earth the Northern hemisphere its North-South axis tilts towards or away from the sun
goes pointing pointing
round T:the sun during the year
more towards the sun T:during the summer and the Southern hemisphere
more towards the sun T:during the winter