Tall Tweets will slice your tweet into multiple smaller tweets of 140 characters or less, and publishes them all to Twitter in a sequence. The tweets are numbered and are sent in a reverse arrangement such that they can be read from top-to-down inside any Twitter client.
Alternatively, you may choose to publish your long tweet as an image and in that case, the entire text gets published in a single tweet. The image tweets are rendered in the Roboto font (originally design by Google for Android) and thus the text in the images should be readable even on mobile screens.