I often have to present a complex result and explain why it is true. Doing so in a single sentence usually makes it too long and difficult to understand. But how do you succinctly do this in two sentences. For example consider the sentence

When stocks increase in price, people want to buy them, increasing the price further, until the stock reaches a critical threshold, after which people sell and the price falls. The reason why this is true is that ...

I'm looking for some less clunky starting phrases, to start the second sentence, that warn the reader that an explanation is about to follow and not a new idea. Or I am also looking for other ways to deal with this issue.

  • "This is because"; "The reason for this is"; "An explanation for this is as follows" (Not exactly a start for a sentence, but it works well with a colon). Jul 20, 2014 at 19:24
  • I suggest you can rephrase as follow: 'People tend to buy stocks when prices increase, causing prices to go even higher. Once stock prices reach a critical threshold they will sell causing prices to fall. We can explain the reason for this general behaviour ..... '
    – user66974
    Jul 20, 2014 at 20:01

4 Answers 4


This is because...

They do this because...

; (replace the period with a semicolon)


The most economical means of signaling that a sentence provides grounds or warrant for the claim advanced by the preceding sentence is to begin the second sentence with For. OED s.v. for, B. conj., 2.a.:

Introducing the ground or reason for something previously said: Seeing that, since. Cf. Greek γάρ, Latin nam or enim, French car, German denn.

Note that the English equivalents listed here (“seeing that, since”) cannot so well lead off a separate sentence, though they can be used to introduce grounds or warrant for a preceding clause where only a comma precedes.


... The explanation for this is

... This is explained by

... The rationale is


This is do to would definitely be a good starter to use.

  • I think you mean "due to".
    – user888379
    Oct 31, 2019 at 20:49

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